Change misleading script names, solves #329

[rlopezcoto]

Following #329, I changed:

• dl0_to_dl1.py => r0_to_dl1.py
• lstchain_mc_dl1_to_dl2.py => lstchain_dl1_to_dl2.py
• lstchain_data_muon_analysis_dl1.py => lstchain_muon_analysis.py

and the scripts/tests/notebooks where they were called

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[codecov]

Codecov Report

Merging #334 into master will increase coverage by 0.70%.
The diff coverage is 53.33%.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   42.88%   43.59%   +0.70%     
==========================================
  Files          70       69       -1     
  Lines        4694     4618      -76     
==========================================
  Hits         2013     2013              
+ Misses       2681     2605      -76     

Impacted Files	Coverage Δ
lstchain/reco/r0_to_dl1.py	69.60% <ø> (ø)
lstchain/scripts/lstchain_data_r0_to_dl1.py	0.00% <0.00%> (ø)
lstchain/scripts/lstchain_dl1_muon_analysis.py	0.00% <ø> (ø)
lstchain/scripts/lstchain_dl1_to_dl2.py	0.00% <ø> (ø)
lstchain/scripts/lstchain_mc_r0_to_dl1.py	0.00% <0.00%> (ø)
lstchain/scripts/lstchain_mc_r0_to_dl2.py	0.00% <0.00%> (ø)
lstchain/io/tests/test_io.py	100.00% <100.00%> (ø)
lstchain/mc/tests/test_senstivity.py	93.61% <100.00%> (ø)
lstchain/reco/__init__.py	100.00% <100.00%> (ø)
lstchain/scripts/tests/test_lstchain_scripts.py	100.00% <100.00%> (ø)
... and 3 more

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[maxnoe]

Maybe keep the dl1 in the muon script? Just for clarity? lstchain_dl1_muon_analysis