Various restructure of test framework handling of paths to avoid duplicate path editing which caused failed tests. Adjust many tests to deal with added subdirectories in build outputs now that toolset requirements are active.
it included MSVC...
* new/toolset.jam:
Allow action names with dots, so that we can set flags for
gcc.compile.c, gcc.compile and gcc and combine those flags.
* tools/gcc.jam: Use 'gcc' for compiling C files. There's still a problem:
'init' rules does not allow to configure name of C compiler. Also, don't
declare flags individually for gcc.link and gcc.link-dll.
* tools/borland.jam: Force C++ compile when needed.
[SVN r18774]
