[FIX] Deal with circleci errors

[DESm1th]

This fixes:

• An out of date datman test
• An issue with sphinx/docutils failing to build valid docs
• A call to checksum a file that hadnt yet been checked out that was causing errors

[codecov]

Codecov Report

Merging #316 (5ef93b2) into master (a2fbd26) will increase coverage by 8.75%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
+ Coverage   22.63%   31.38%   +8.75%     
==========================================
  Files          61       61              
  Lines        9123     9125       +2     
==========================================
+ Hits         2065     2864     +799     
+ Misses       7058     6261     -797     

Impacted Files	Coverage Δ
tests/test_dm_qc_report.py	100.00% <100.00%> (+29.94%)	⬆️
tests/test_scan.py	100.00% <100.00%> (+68.00%)	⬆️
datman/header_checks.py	18.07% <0.00%> (+3.61%)	⬆️
datman/utils.py	18.03% <0.00%> (+5.34%)	⬆️
bin/dm_xnat_upload.py	20.90% <0.00%> (+6.81%)	⬆️
bin/dm_redcap_scan_completed.py	25.00% <0.00%> (+7.81%)	⬆️
datman/config.py	57.63% <0.00%> (+10.76%)	⬆️
bin/dm_qc_report.py	31.75% <0.00%> (+11.05%)	⬆️
datman/xnat.py	27.67% <0.00%> (+16.47%)	⬆️
datman/scan.py	93.13% <0.00%> (+18.62%)	⬆️
... and 9 more

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