[Ferm] patches for file name handling

[Marc Haber]

Hi,

please consider the following two patches: One adds two functions
@basename and @dirname doing the obvious via File::Spec::splitpath,
and one introducing a new automatic variable FILEBNAME which contains
only the base name of the file as opposed to FILENAME which may
contain path components if we included files from other directories.

The patches include test cases and adapt the documentation.

The test case for FILEBNAME could include test cases for FILENAME and
DIRNAME, but I couldn't figure out how to handle the variable parts of
the path component.

Greetings
Marc

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