Multiple bug fixes

[irzamsarfraz]

1. Some fixes for testing version of Seurat package (new base R returns a class object for versions instead of just numeric).
2. One instance of runUMAP had hardcoded initialDims which should not be there.
3. With newer seurat version convertSCEtoSeurat has some minor issues such as the reducedDim cell names do have hyphen in them when copying non-seurat reducedDim, resulting in errors downstream. I have added a temporary fix in the heatmap function, but eventually it should be fixed in the convertSCEToSeurat function.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.10%. Comparing base (cebf8f2) to head (6155f27).
Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
R/runDimReduce.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel     #768   +/-   ##
=======================================
  Coverage   52.09%   52.10%           
=======================================
  Files          79       79           
  Lines       12983    12985    +2     
=======================================
+ Hits         6764     6766    +2     
  Misses       6219     6219           

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