Multiple fixes and refactoring

[vsimko]

I removed the new isMixed parameter which also fixes issue #102 and used the mar parameter instead. This way, the issue #102 is fixed and we don't have to extend the already huge API of corrplot.

Additionally in this pull request:

• Fixed issues #94, #96 and perhaps others when the "upper" matrix is rendered with t.pos="n".
• Also added some more examples to the vignette.
• Refactored some rendering code to separate pure functions. We will refactor the corrplot functional hopefully in future.

[codecov-io]

Codecov Report

Merging #103 into master will increase coverage by 0.41%. The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master     #103      +/-   ##
==========================================
+ Coverage   91.33%   91.75%   +0.41%     
==========================================
  Files           7        8       +1     
  Lines         612      643      +31     
==========================================
+ Hits          559      590      +31     
  Misses         53       53

Impacted Files	Coverage Δ
R/corrMatOrder.R	100% <ø> (ø)	:arrow_up:
R/cor-mtest.R	100% <100%> (ø)
R/corrplot.R	89.9% <100%> (+0.18%)	:arrow_up:
R/corrplot.mixed.R	91.66% <71.42%> (+0.75%)	:arrow_up:

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[taiyun]

Three cor.mtest() in Rmd file. Just need one.

[vsimko]

I just refactored the cor.mtest() function that was used on multiple places (see also issue #82). The function now returns a list containing three elements: p, lowCI and uppCI which I think is better than just a tuple.

[vsimko]

I see. The problem is that we linked to some external figure on the web which is not accessible anymore. I'll fix it.

[vsimko]

Now the build finally passes!

[taiyun]

The figure in README.md is not generated by

corrplot(M, order = "hclust", addrect = 2)

[vsimko]

fixed through web interface