set "localParitioning" scheme to be the default one when not set

[lrog]

Minor changes, mostly for ease of use when defining job configuration:

• set localParitioning profile to be active by default one when not set.
• minor polishing of printing exception stack trace in Main.
  In any case, we are also planning to deprecate the master-slave mode which uses remotePartitioning, hence the localPartitioning should be the default one.

[lrog]

The last two commits make setting source.srcTableName, source.srcColumnFieldName and source.primaryKeyFieldName properties optional. The information supplied by these properties was used only within docman profile (deprecated) -- when trying to read documents, possibly form the filesystem, and reading the info from the metadata table.
Making these properties optional for common use-cases and required only in docman profile will simplify the usage as these columns won't be needed in the source DB table.