Pod coverage for Perl modules.

Pod coverage for Perl modules.

* lib/Automake/ChannelDefs.pm (parse_warnings): Fix
typo in Pod documentation.
* lib/Automake/Condition.pm: Add a couple of missing `=back'
lines.
(_has): Renamed from ...
(has): ... this, as this is an internal method.
(strip, false, true_when): Adjust callers.
* lib/Automake/Configure_ac.pm: Add Pod `Functions' section with
documentation for find_configure_ac and require_configure_ac.
* lib/Automake/Location.pm: Fix typo in Pod.  Add `Methods'
section, document methods.
* lib/Automake/RuleDef.pm: New `Methods' Pod section.
* lib/Automake/VarDef.pm: Document `raw_value'.
* lib/Automake/Wrap.pm (_tab_length): Rename from ...
(tab_length): ... this, as this is an internal method.
(wrap): Adjust callers.
* lib/Automake/XFile.pm: Reorganize Pod a bit, add `Methods'
section.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>