Added error checking and enforce 1 to 1 keys in header validation

[fsuits]

Signed-off-by: FrankSuits frankst@au1.ibm.com

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commits are signed-off.

Enforce 1:1 keys in header validation
Added error checking and test for bold header in template
Changed validation text output for easier reading by user

[fsuits]

This is just to show initial progress in md and to see if my change to user output (VALID INVALID) and providing text response when validation passes are ok.

[codecov]

Codecov Report

Merging #512 (ae9b35d) into develop (b2b0db6) will decrease coverage by 0.01%.
The diff coverage is 93.93%.

@@             Coverage Diff             @@
##           develop     #512      +/-   ##
===========================================
- Coverage    98.14%   98.12%   -0.02%     
===========================================
  Files           76       76              
  Lines         7372     7411      +39     
===========================================
+ Hits          7235     7272      +37     
- Misses         137      139       +2     

Impacted Files	Coverage Δ
trestle/core/commands/md_subs/governed_docs.py	84.55% <86.95%> (+0.20%)	⬆️
trestle/core/commands/md_subs/governed_folders.py	85.82% <90.00%> (-0.44%)	⬇️
trestle/core/commands/md.py	100.00% <100.00%> (ø)
trestle/core/markdown_validator.py	94.55% <100.00%> (+0.53%)	⬆️
trestle/utils/fs.py	96.37% <100.00%> (+0.08%)	⬆️

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[fsuits]

Added header support in gov. folders and checks for symlinks.

[butler54]

As discussed offine:

• add functionality such that directory trees can be recursively covered by cov

[butler54]

LGTM