Feature: parallel manyTopics()

[mikajoh]

manyTopics(), when length(K) > 1, can now run in parallel.

• manyTopics now run in parallel using parallel::mclapply(), the same approach that were implemented for stm::searchK().
• It takes a new argument cores, which defaults to parallel::detectCores(), i.e., the amount of available cores on the machine.

[codecov-io]

Codecov Report

Merging #162 into development will decrease coverage by 1.59%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##           development     #162     +/-   ##
==============================================
- Coverage        27.75%   26.16%   -1.6%     
==============================================
  Files               59       59             
  Lines             3635     3191    -444     
==============================================
- Hits              1009      835    -174     
+ Misses            2626     2356    -270

Impacted Files	Coverage Δ
R/manyTopics.R	0% <0%> (ø)	⬆️
R/stm.R	53.17% <0%> (-13.66%)	⬇️
R/STMconvergence.R	78.26% <0%> (-7.46%)	⬇️
R/textProcessor.R	71.23% <0%> (-7.27%)	⬇️
R/STMoptbeta.R	80% <0%> (-5.72%)	⬇️
R/readCorpus.R	18.75% <0%> (-5.58%)	⬇️
R/plot.STM.R	36.98% <0%> (-5.48%)	⬇️
R/STMinit.R	57.14% <0%> (-5.45%)	⬇️
R/prepDocuments.R	67.74% <0%> (-4.49%)	⬇️
R/STMreport.R	24.24% <0%> (-3.97%)	⬇️
... and 43 more

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