added parameter envelope and clams envelop command

[keighrim]

fixes #224

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.25%. Comparing base (f18c944) to head (87049f2).

Files with missing lines	Patch %	Lines
clams/envelop/__init__.py	94.11%	3 Missing ⚠️
clams/__init__.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #287      +/-   ##
===========================================
+ Coverage    61.76%   64.25%   +2.48%     
===========================================
  Files            7        8       +1     
  Lines          816      884      +68     
===========================================
+ Hits           504      568      +64     
- Misses         312      316       +4     

Flag	Coverage Δ
unittests	64.25% <94.44%> (+2.48%)	⬆️

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