Add log partitioning similar to fpart

This merge adds functionality that replicates fpart's live mode except using GPFS log data instead of crawling the filesystem. This allows us to divide any processed GPFS log into partitions to pass to parsyncfp2 for transfer.

Major Changes

• Added process.gpfspart command and its corresponding gpfspart CLI command.

Bugfixes

• Fixes convert_si to properly match lowercase letters for its defined units. This allows someone to pass either 4K or 4k and mean the same thing.