Various UI improvements + Pybids 0.12.3

[adelavega]

• Closes allow unititled analyses? #823
  • Allow united analyses until compilation (then backend rejects compilation until you provide a name).
• Closes make hash_id 8 chars and case insensitive #833 and switch to uuid #838
  • Switch to 5 char UUID, checking for clashes upon generation
• Closes Reports: Throw warning when n/a present #770 by throwing warning if any n/as are found in variables. It suggesting using the Scale transformation to remove n/as.
• Default option for scale is to replace n/a with 0 after scaling.
• Closes clean up API #795. Minor API improvements.

[adelavega]

@rwblair can you also tackle #826 on this one?

[adelavega]

For the n/a problem:
Scale - make replace after scale default value
Add docs in warning about doing this.

[adelavega]

Fixed #821 by using new version of pybids which has a fix for this. Also bumped to latest pybids version. Need to update the PIN once the official release comes through.

We should also address the fact that correlation matrix plots are not showing up in this PR.

[rwblair]

f02e32e fixes #826

[adelavega]

@rwbair just a reminder to tackle #824 tomorrow if you get a chance (in this PR if it's still open, thanks).

[adelavega]

Just to recap things left to do:

• Waiting to @tyarkoni to review my pybids PR, so we can cut a new release and PIN it here

[codecov-io]

Codecov Report

Merging #837 into master will decrease coverage by 0.45%.
The diff coverage is 61.33%.

@@            Coverage Diff             @@
##           master     #837      +/-   ##
==========================================
- Coverage   82.55%   82.09%   -0.46%     
==========================================
  Files          63       63              
  Lines        2917     2960      +43     
==========================================
+ Hits         2408     2430      +22     
- Misses        509      530      +21     

Impacted Files	Coverage Δ
neuroscout/core.py	67.74% <ø> (ø)
neuroscout/resources/__init__.py	100.00% <ø> (ø)
neuroscout/resources/analysis/__init__.py	100.00% <ø> (ø)
neuroscout/resources/analysis/reports.py	51.11% <0.00%> (-0.77%)	⬇️
neuroscout/resources/dataset.py	100.00% <ø> (ø)
neuroscout/tasks/utils/warnings.py	73.52% <30.00%> (-14.94%)	⬇️
neuroscout/resources/analysis/endpoints.py	88.81% <31.25%> (-6.36%)	⬇️
neuroscout/resources/predictor.py	86.91% <50.00%> (-3.81%)	⬇️
neuroscout/utils/db.py	83.56% <62.50%> (-2.81%)	⬇️
neuroscout/tasks/utils/build.py	90.90% <91.66%> (+5.80%)	⬆️
... and 6 more

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