clib2 Code

- The execve() code that looks for the command/script file now begins by
checking if the file name includes path separators. If it does not,
then the search for the command begins with the resident command list;
otherwise the local directories are checked. The new code also properly
cleans after itself (a FreeDeviceProc() was missing) and the "PROGDIR:"
lock now always refers to the directory in which the command/script
file is found.

- Cleaned up and updated the .cvsignore file.

- Changed the execvp() test program to reflect how the corrected
execvp() function works.

- Added the missing fdim() and fdimf() functions to the build
makefiles. The OS4 build makefile was missing lrint() and
lrintf(). Ouch.

- execve() now checks if an abort signal arrives while it's trying
to read the first line of a script, or looking for an executable
on an assignment path.

- execve() no longer directly calls exit(), but a function which can be
replaced by the user. If that function __execve_exit() does not call
exit but just returns to the caller without doing anything, execve()
will return the caller with the return code of the RunCommand()
function.

- Small corrections...

- That's setlocale and not setlocate.

- Hid setlocale and execvp_test

- execve() now actually works!

- Added the "execvp_test" program.