new modules for looking up the ancestors of a process

[Bruno Haible]

Here are two new modules, that I propose to add to gnulib:
  * get_ppid_of     - Determine the parent process of a given process.
  * get_progname_of - Determine the program name of a given process.

Usually all the information that a process needs is passed down from the
ancestor processes. But sometimes we have situations when e.g. a program
must behave differently in konsole than in gnome-terminal. These are weird
situations, but one needs a way to cope with them.

0001-get_ppid_of-New-module.patch
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0002-get_progname_of-New-module.patch
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