Close the dev branch

[latk]

By now, all changes from the dev branch have been reimplemented on master. This PR merges the dev branch into master, without applying any of the dev changes. That way, the Git history is retained and dev can be safely deleted.

While dev and master took some different directions (e.g. the module structure), they are now functionally equivalent. All bug fixes and enhancements that were made on dev have also been done on master.

• Modularization was implemented in Modularization #225
• the driver/main was extracted in Move script/gcovr to gcovr/__main__.py #214
• a global "make clean" is useful but not strictly necessary
• Travis config was committed independently in 0afac3a

Where large parts of code were extracted, I didn't review that carefully to ensure that no fixes were sneaked in together with the refactoring. The dev branch has one change to the HTML code that master doesn't have, but I don't understand why it might be necessary:

@@ -468,7 +470,7 @@ def _alpha(key):
     data = {}
     data['HEAD'] = "Head"
     data['VERSION'] = version_str()
-    data['TIME'] = str(int(time.time()))
+    data['TIME'] = str(int(time()))
     data['DATE'] = date.today().isoformat()
     data['ROWS'] = []
     data['low_color'] = low_color

I think it is safe to ignore that, as the dates in the HTML are known to work – and that field isn't actually used anywhere.

[codecov]

Codecov Report

Merging #246 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #246   +/-   ##
=======================================
  Coverage   88.76%   88.76%           
=======================================
  Files          13       13           
  Lines        1477     1477           
  Branches      267      267           
=======================================
  Hits         1311     1311           
  Misses        108      108           
  Partials       58       58

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