/node.d/tomcat_threads.in: Fix if {'currentThreadsBusy'} go false when it is 0, and add a total value as 'currentThreadCount' so that the chart looks more readable.
M::M::U: Store graph categories in SQL in lowercase

As discussed on IRC, graph categories should be case insensitive.
Fix minor typos in Munin master index.rst

Fixed some minor typos.
If value is defined and not "U", try to ensure it looks like a number

This is a quick fix. "looks_like_number" allows more than RRD does,
but will cut down on strange things passed by plugins.

The "proper" fix will be for munin-update to validate input properly.
cgi/html: Implement basic category view

warning/critical state and graphs without explicit categories are
not supported yet.
M::M::U: Export plugin/field directives for custom graphs to SQL
cgi/html: Fix URLs for comparison views
Merge remote-tracking branch 'upstream/master' into cgi-html-fixes-to-match-static-html

Conflicts:
	master/lib/Munin/Master/Update.pm
cgi/html: group comparison view
Merge remote branch 'pull/230' into devel
Merge remote branch 'pull/234' into devel
Add "testcover", "testpod" and "testpodcoverage" targets to Makefile
Makefile: update list of secondary targets

 - Missing one "Build"

 - */MANIFEST should also not disappear for each invocation of "make"
Makefile: add a "testcritic" convencience target

 - the tests are already present, but not used by default
remove POD tests already provided by Module::Build

Module::Build has functionality for this, so we do not need to repeat this in our unit tests. The
following convenience targets has been added to Makefile already:

 - "make testpod" for POD syntax checs

 - "make testpodcoverage" for POD coverage

 - "make testcover" for test (and POD) coverage.
Remove mention of Log4perl in INSTALL

 - it is no longer used
Fix POD errors
Document is_keyword and cl_is_keyword in Munin::Common::Config
Merge pull request #239 from ssm/fix/remove-log4perl-doc

Remove mention of Log4perl in INSTALL
Merge pull request #240 from ssm/fix/pod

Fix/pod