Allow escaped commas in config parameters.  Update Core::SMART docs and stop prefixing metrics with the disk name, as Resmon already uses check_name in the final metric output.

To avoid warning messages like:
"Use of uninitialized value $bits in string eq at /opt/resmon/lib/Resmon/Config.pm line 16..."
$bits variable should be checked if it is defined before comparison with empty string

Hosts allow-deny lists are the coma or blank separated lists of
a dotted decimal IPv4 addresses of the form a.b.c.d. to match incoming machine’s IP address exactly,
or an 'ipaddr/n' where ipaddr is the IP address and n is the number of one bits in the netmask.
The first to occur match gives the result, skipping other rules.
If nothing matches IP is allowed.

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This means that if a particular check is loaded twice (Same module, same check
name), the most recently loaded one will take precedence. This allows included
files to override default behavior with certain checks if required.

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Syntax (used outside of module configuration stanzas):

INCLUDE filename.conf

Supports the following substitutions:

%h - hostname (uses Sys::Hostname)
%o - operating system name (uses $^O)

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This is much simpler than the previous version, reusing the configure class. I
think the previous version failed because entries have to be deleted from %INC
before being reloaded.

Warnings are still printed saying functionname redefined. This can be fixed
with "no warnings 'redefine';" in each module, but it would be nice to not
require module writers to have to do that. There is probably a way to set that
when loading the module from Config.pm.

git-svn-id: https://labs.omniti.com/resmon/branches/resmon2@278 8c0face9-b7db-6ec6-c4b3-d5f7145c7d55

Add failed modules (or checks) to list of failed modules
Show this in Resmon.pm
Only run use Module::Name once per module instead of once per check.

git-svn-id: https://labs.omniti.com/resmon/branches/resmon2@276 8c0face9-b7db-6ec6-c4b3-d5f7145c7d55

Each module is an object inheriting from Resmon::Module as before, but the
code to support coderefs and raw packages with a handler function is all gone.
In addition, a lot of redundant code was removed, and some small changes made
to the modules themselves:

    - The check name is stored in $self->{check_name} (instead of
      $self->{object} as in the past)
    - The check configuration is stored in $self->{config} and not just as
      instance variables.
    - All modules must have fully qualified names in the config file. In other
      words - Resmon::Module::Resmon instead of just RESMON. In keeping with
      other perl module names, I've gone with Title Case instead of ALL CAPS
      for the sample module (Resmon). This is simple to change back if desired
      however.

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    - Broken modules on startup will not cause resmon to quit, but will be
      added to the failed modules list and have a status shown as BAD.
    - Broken modules on startup will no longer break the XML (because there is
      no config_as_hash to generate the configuration from)
    - Reloading modules that were initially broken (either from startup or
      from adding them to the config file and reloading) now works correctly.


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error message when starting with a faulty module.


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