Modified mincApply by:

1) Changing paramter name to "workers"
2) Outputting indicating the worker number
3) Modifying minc2_model which was broken when using the "eval" option
4) Updating the man page
pMincApply was broken by the new version of R. The following fixes were made:

1) Manually setting options for Rsge
2) Setting REDUCE = true by default to prevent memory issues
3) Checking for empty global and package parameters
4) A fix for REDUCE = false was made, but currently REDUCE will always be true

Additionally mincApply was changed so that it attempts to run minc2_model
a set number of times since this function sometimes randomly fails when
running it on the cluster. This failing likely has something to do with
the use of a mask file.
Added test cases for mincApply and pMincApply with single and multiple outpts.
Test cases exist for snowfall, but currently not for the sge option because
the test data is currently being stored on the local machines /tmp drive