TODO

 - -t with package-name/file-name (build tests for this package/files only)
 - -o with -t should also be useful for filenames
 - change root path if command line to main file is in a different (non-sub) directory
 - goyacc support for .y files
 - create (HTML) docs (without HTTP-server)
 - support for external librarys (run cgo and figure out include paths? might need gobuild.hint first)
 - differ between packages with same name but different paths (error?)
 - BUG: if package file is in depth-2 sub-dir with wrong names, compilation fails
 - (optional) colorize errors/warnings
 - exclude command line parameter -X (for files/filemasks/directories)
 - automatic build repair (react on some compile/link errors)
 - gobuild.hint file
 - (optional) Makefile creator
 - make the -clean option safer/better (error if wrong permissions, no .go files, etc.)
 - support gccgo
 - Windows support (might just work...?)