master: fix limits computation for ABSOLUTE

As bobkare reported on IRC:

    ... limits for ABSOLUTE fields are matched against raw input
values rather than value/$poll_interval like other time-based
counters?

This commit does fix the issue. Limits do now behave like their
COUNTER & DERIVE counterparts.
Merge branch 'fix-absolute' into stable-2.0
Revert "plugins/Plugin.pm: fix bad state file handling"

This reverts commit bf7a258081d64bb6174f83482d5d6dd53cb5909a.

It breaks some plugins, like diskstats.
Merge branch 'fix-state' into stable-2.0
2.0.14
Merge commit '2.0.14' into devel

Conflicts:
	ChangeLog
	plugins/lib/Munin/Plugin.pm