adding cp2k/restart_aimd_ouput

[dmh1998dmh]

When a restart_aimd_output is mentioned, the first step in log file is skipped. A restarted cp2k aimd example was also added.

[felix5572]

Could you please add a unittest test case to test the restart flag?

I will write down the unittest and pull request to your repo soon.

@dmh1998dmh

I a pr to your repo at dmh1998dmh#1

[codecov-commenter]

Codecov Report

Merging #140 (bee8521) into master (cf4c99b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   84.36%   84.37%   +0.01%     
==========================================
  Files          28       28              
  Lines        3326     3329       +3     
==========================================
+ Hits         2806     2809       +3     
  Misses        520      520              

Impacted Files	Coverage Δ
dpdata/cp2k/output.py	98.04% <100.00%> (+0.02%)	⬆️
dpdata/system.py	80.13% <100.00%> (ø)

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