Update analyze CSV output settings

[MSiggel]

Fixes #95

Changes made in this pull request:

• saner csv output names
• default behavior of analyze changed such that by default no csv is saved.
• when invoking --save-csv a file is saved

PR Checklist

• Added changelog fragment in ./changelog/ (more information)?
• Issue raised/referenced?

[mimischi]

One change, one question. Otherwise we are good to go!

[codecov]

Codecov Report

Merging #119 into develop will decrease coverage by 0.43%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           develop     #119      +/-   ##
===========================================
- Coverage    96.54%   96.11%   -0.44%     
===========================================
  Files           14       14              
  Lines          723      720       -3     
===========================================
- Hits           698      692       -6     
- Misses          25       28       +3

Impacted Files	Coverage Δ
mdbenchmark/utils.py	96.33% <ø> (-2.77%)	⬇️
mdbenchmark/analyze.py	71.05% <50%> (-1.45%)	⬇️

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[mimischi]

Oh, this is actually missing a changelog file @MSiggel. Could you please add this? Then we're really finished.