Enable the Checkpoints

[dimalvovs]

Can we get saving and starting from Checkpoints reinitialized for CoGAPS? Otherwise given the execution speed the results are lost if runtime is longer than the time limit for some of compute clusters.

[dimalvovs]

The checkpoints are disabled by default:

> 
> library("CoGAPS")
> packageVersion("CoGAPS")
[1] ‘3.24.0’
> CoGAPS::checkpointsEnabled()
[1] FALSE

It looks like these are disabled in https://github.com/FertigLab/CoGAPS/blob/cc8c42cd2a9dc9c99e63e22dba076fabfdb8461e/configure#L3241

Potentially could be enabled by removing the -DGAPS_DISABLE_CHECKPOINTS flag.

[dimalvovs]

Related to #49