tiny C support; cosmetic improvements for the docs

doc/basicopt.txt

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+Usage::
+  nimrod command [options] inputfile [arguments]
+
+Command:
+  //compile, c              compile project with default code generator (C)
+  //compileToC, cc          compile project with C code generator
+  //doc                     generate the documentation for inputfile
+  //rst2html                converts a reStructuredText file to HTML
+  //rst2tex                 converts a reStructuredText file to TeX
+
+Arguments:
+  arguments are passed to the program being run (if --run option is selected)
+Options:
+  -p, --path:PATH           add path to search paths
+  -o, --out:FILE            set the output filename
+  -d, --define:SYMBOL       define a conditional symbol
+  -u, --undef:SYMBOL        undefine a conditional symbol
+  -f, --forceBuild          force rebuilding of all modules
+  --stackTrace:on|off       turn stack tracing on|off
+  --lineTrace:on|off        turn line tracing on|off
+  --debugger:on|off         turn Embedded Nimrod Debugger on|off
+  -x, --checks:on|off       turn all runtime checks on|off
+  --objChecks:on|off        turn obj conversion checks on|off
+  --fieldChecks:on|off      turn case variant field checks on|off
+  --rangeChecks:on|off      turn range checks on|off
+  --boundChecks:on|off      turn bound checks on|off
+  --overflowChecks:on|off   turn int over-/underflow checks on|off
+  -a, --assertions:on|off   turn assertions on|off
+  --floatChecks:on|off      turn all floating point (NaN/Inf) checks on|off
+  --nanChecks:on|off        turn NaN checks on|off
+  --infChecks:on|off        turn Inf checks on|off
+  --deadCodeElim:on|off     whole program dead code elimination on|off
+  --opt:none|speed|size     optimize not at all or for speed|size
+  --app:console|gui|lib     generate a console|GUI application|dynamic library
+  -r, --run                 run the compiled program with given arguments
+  --advanced                show advanced command line switches
+  -h, --help                show this help