Redesigned naming scheme, options instead of flags

- Struct names are now clearer, realized the "flags" were actually
  options
  - argagg::flag is now argagg::option_result
  - argagg::flags is now argagg::option_results
  - argagg::result is now argagg::parser_results
  - argagg::flag_spec is now argagg::definition
- Updated documentation and examples accordingly
- Removed old Doxygen style.css
- Added option_lacks_argument_error exception class
- Added associated flag to exception error messages
- Moved argagg::flag_spec::optional to argagg::optional

3 files changed, 17 insertions, 1525 deletions

diff --git a/doc/doxygen.cfg.in b/doc/doxygen.cfg.in
index 4fabedc..703aaba 100644
--- a/doc/doxygen.cfg.in
+++ b/doc/doxygen.cfg.in
@@ -131,7 +131,7 @@ HTML_FILE_EXTENSION    = .html
 HTML_HEADER            =
 HTML_FOOTER            =
 HTML_TIMESTAMP         = NO
-HTML_STYLESHEET        = @CMAKE_CURRENT_SOURCE_DIR@/doc/style.css
+HTML_STYLESHEET        =
 HTML_ALIGN_MEMBERS     = YES
 HTML_DYNAMIC_SECTIONS  = NO
 GENERATE_DOCSET        = NO
diff --git a/doc/root.md b/doc/root.md
index a64884e..df67eaa 100644
--- a/doc/root.md
+++ b/doc/root.md
@@ -9,14 +9,16 @@ To use just create an argagg::parser object. However, the struct doesn't provide
         { "help", {"-h", "--help"},
           "shows this help message", 0},
         { "delim", {"-d", "--delim"},
-          "delimiter (default: ,)", argagg::flag_spec::optional},
+          "delimiter (default: ,)", 1},
+        { "num", {"-n", "--num"},
+          "number", 1},
       }}
 
-A flag is specified by four things: the name of the flag, the strings that activate the flag, the flag's help message, and the number of arguments the flag expects.
+An option is specified by four things: the name of the option, the strings that activate the option (flags), the option's help message, and the number of arguments the option expects.
 
-With the parser defined you actually parse the arguments by calling the argagg::parser::parse() method. If there are any problems then either a std::out_of_range or argagg::unexpected_flag_error exception.
+With the parser defined you actually parse the arguments by calling the argagg::parser::parse() method. If there are any problems then either an argagg::option_lacks_argument_error or argagg::unexpected_flag_error exception.
 
-    argagg::result args;
+    argagg::parser_results args;
     try {
       args = argparser.parse(argc, argv);
     } except (const std::exception& e) {
@@ -24,16 +26,7 @@ With the parser defined you actually parse the arguments by calling the argagg::
       return EXIT_FAILURE;
     }
 
-You can check if a flag shows up in the arguments using the argagg::result::has_flag() method and giving it the flag name (not the flag text itself). You can write out some simplistic flag help message but streaming the argagg::parser instance itself.
-
-    if (args.has_flag("help")) {
-      std::cerr << argparser;
-      //    -h, --help
-      //        shows this help message
-      return EXIT_SUCCESS;
-    }
-
-There's also an implicit boolean conversion you can use.
+You can check if an option shows up in the command line arguments by accessing the option by name from the parser results and using the implicit boolean conversion. You can write out a simplistic option help message by streaming the argagg::parser instance itself.
 
     if (args["help"]) {
       std::cerr << argparser;
@@ -55,10 +48,17 @@ That help message is only for the flags. If you want a usage message it's up to
 
 Generally argagg tries to do a minimal amount of work to leave most of the control with the user.
 
-If you want to get a flag argument but fallback on a default value if it doesn't exist then you can use the argagg::flags::as() API but providing a default value.
+If you want to get an option argument but fallback on a default value if it doesn't exist then you can use the argagg::option_results::as() API and providing a default value.
 
     auto delim = args["delim"].as<std::string>(",");
 
-Finally, you can get all of the positional arguments as an std::vector using the argagg::results::pos member.
+If you don't mind being implicit an implicit conversion operator is provided allowing you to write simple assignments.
+
+    int x = 0;
+    if (args["num"]) {
+      x = args["num"];
+    }
+
+Finally, you can get all of the positional arguments as an std::vector using the argagg::parser_results::pos member.
 
 For a more detailed treatment take a look at the examples or test cases.
diff --git a/doc/style.css b/doc/style.css
deleted file mode 100644
index 6a38787..0000000
--- a/doc/style.css
+++ /dev/null
@@ -1,1508 +0,0 @@
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