[REF] Remove BCTParamError

[mattfeld]

Closes #29.

Changes proposed in this pull request:

• Removed all references to BCTParamError
• Replaced with in-built exceptions
• Changed error text to be more informative

[tsalo]

There are a couple of bugs that need to be fixed, which flake8 caught here. Specifically, it looks like RunTimeError should be RuntimeError, ValueError was mistyped as ValueErro once, there are a few lines that are too long, and there are a couple of other random spacing errors.

[codecov-io]

Codecov Report

Merging #36 into master will decrease coverage by 0.02%. The diff coverage is 12.96%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   41.61%   41.58%   -0.03%     
==========================================
  Files          41       41              
  Lines        5006     4999       -7     
==========================================
- Hits         2083     2079       -4     
+ Misses       2923     2920       -3

Impacted Files	Coverage Δ
brainconn/utils/misc.py	72.72% <ø> (-1.56%)	:arrow_down:
brainconn/utils/matrix.py	60.81% <0%> (-0.53%)	:arrow_down:
brainconn/utils/visualization.py	3.38% <0%> (-0.33%)	:arrow_down:
brainconn/generative/generative.py	2.04% <0%> (-0.29%)	:arrow_down:
brainconn/nbs.py	77.98% <0%> (-0.21%)	:arrow_down:
brainconn/core/core.py	49.79% <0%> (-0.21%)	:arrow_down:
brainconn/utils/__init__.py	100% <100%> (ø)	:arrow_up:
brainconn/motifs/motifs.py	3.08% <25%> (ø)	:arrow_up:
brainconn/clustering/clustering.py	60.53% <33.33%> (ø)	:arrow_up:
brainconn/similarity/similarity.py	8.51% <33.33%> (ø)	:arrow_up:
... and 3 more

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[tsalo]

Looks good to me. Will merge once tests pass. Thanks!