Detect busybox logger and change logger cmdline

The busybox logger command (used on embedded systems and such) does not
support the -i option and die squaking if it's used. If the logger
configured is a symlink to busybox, the -i option must not be used.
rsnapshot-diff: Fixed removed files reported as addition (+ mark)

Fix an obvious copy/paste mistake in rsnapshot-diff.pl introduced
by 00e2f5085bd476ab867595d0ecbbed71264e9b5f
Fixed pod2man location.

Uses the pod2man present in the user path. Especially usefull if the
user has perl & pod2man installed in /usr/local/
Report the correct filename in error messages when parse_config_file is called recursively to handle include_conf directives.
Revert "Detect busybox logger and change logger cmdline"

This reverts commit 0a056977d736df3adcc16e99a50dd06efbdb7a0e.

That commit is reverted because from now on we will print the
rnapshot's current pid directly in the tag instead of using the
"-i" option of the logger program. Using the "-i" option prints out
the PID of the logger program itself (therefore making it impossible to
correlate log lines and rsnapshot instances when there are multiple ones
running simultaneously).
Print rnspashot's PID when logging to syslog

Print rsnapshot's PID instead of the logger's PID when logging to
syslog. This is much more useful because it allow to relate log
lines to rsnapshot instances when there are multiple concurrent
ones. Previously each line had a different PID, even those
generated by the same instance.

The change is achieved by dropping the "-i" option from the
logger's call and appending the rnapshot's PID to the tag itself.
Merge pull request #4 from kilburn/syslog-pid

Print rnspashot's PID when logging to syslog (instead of the logger's program PID)
Merge pull request #2 from tobinjt/master

Report the correct filename in error messages when parse_config_file is called recursively to handle include_conf directives.
fix bug reported on sourceforge at https://sourceforge.net/p/rsnapshot/patches/14/
added missing =back.
updated known working perl and redhat family OSes
noted Fedora and EPEL based RPMs
Revert "added missing =back."

This reverts commit f5d99185002284440947f8eac7b216ac77b4f2e4.
Merge branch 'master' into RedHat
Merge pull request #10 from strobert/RedHat

RedHat doc updates from Steven Roberts
Merge branch 'master' into backup_exec

Conflicts:
	ChangeLog