Features/783 api relational

[lenablind]

Aliases for comparison functions in heat.core.relational

This PR is motivated by the request in #774.
It is simply an extension of the current API in the corresponding module.
The following aliases have been implemented:

Original	Alias
gt	greater
ge	greater_equal
lt	less
le	less_equal
ne	not_equal

Issue/s resolved: #783

Changes proposed:

• Aliases for the above listed functions
• Corresponding tests for the functions

Type of change

• New feature (non-breaking change which adds functionality)

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[codecov]

Codecov Report

Merging #792 (afd0506) into master (3338b9d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #792   +/-   ##
=======================================
  Coverage   95.28%   95.29%           
=======================================
  Files          64       64           
  Lines        8934     8944   +10     
=======================================
+ Hits         8513     8523   +10     
  Misses        421      421           

Flag	Coverage Δ
gpu	94.42% <100.00%> (+<0.01%)	⬆️
unit	90.85% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
heat/core/relational.py	100.00% <100.00%> (ø)

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[coquelin77]

rerun tests

[coquelin77]

why not simply point to the existing functions? there is a bit of extra work going on here

i.e.

greater_equal = ge
greater_equal.__doc__ = ge.__doc__

[lenablind]

why not simply point to the existing functions? there is a bit of extra work going on here

i.e.

greater_equal = ge
greater_equal.__doc__ = ge.__doc__

You are right, that makes absolutely more sense indeed. Thanks for the feedback! I'll change it right away.