first attempt to add copy to remote tmp filename and rename

[TAlonglong]

• Closes ScpMover to transfer to a temporary file and rename after completion #148
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

Merging #150 (6ea2c34) into main (5149f50) will increase coverage by 0.18%.
The diff coverage is 98.80%.

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
+ Coverage   88.37%   88.55%   +0.18%     
==========================================
  Files          22       22              
  Lines        4437     4518      +81     
==========================================
+ Hits         3921     4001      +80     
- Misses        516      517       +1     

Flag	Coverage Δ
unittests	88.55% <98.80%> (+0.18%)	⬆️

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

Impacted Files	Coverage Δ
trollmoves/tests/test_ssh_server.py	98.17% <98.46%> (+0.09%)	⬆️
trollmoves/movers.py	84.87% <100.00%> (+0.99%)	⬆️

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