We now accept symbolic and numeric mode strings using the
--mode or -m option for install. This is used either when
moving files into a directory, or when creating component
directories with the -d option. This feature was designed
to mirror the GNU implementation, including the possibly
quirky behaviour of `install --mode=u+wx file dir`
resulting in dir/file having exactly permissions 0300.
Extensive integration tests are included.
This chnage required a higher libc dependency.
We check if the user has given one of the (many)
not yet implemented command line arguments. Upon
catching this, we display the specific transgressor
to stderr and exit with return code 2.
This behaviour is tested in one new integration test.
Bare minimum functionality of `install file dir` implemented.
Also added TODO markers in code for outstanding parameters
and split main function into smaller logical chunks.
Add install utility skeleton source, based on
mv, including the getopts setup mirroring
GNU's `man install` documentation. Also
add a single test and build system code.
