lib/README.txt: clarify where built libraries are located
documentation/src/basics.dox: clarify (C++) compiler command usage
and improve documentation of the fltk-config script
Files without '.txt' suffix can't be handled well by Windows (users),
hence renaming such text files to *.txt makes FLTK more "Windows-friendly".
There are a few exceptions (this is intentional): README and other files
in bundled libraries (maintained upstream) are not changed.
The extension '.lib' is used for Microsoft shared library stubs created in
directory lib/, so it is usefule to ignore *.lib (but not the README file).
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10591 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
