RF: tidier code for previous rating scale autodraw BF
DOC: Fix typos in documentation
DOC: Fix typo in documentation

Found by LanguageTool.
Merge pull request #757 from jeremygray/master

RF: tidier code for previous rating scale autodraw BF
Merge pull request #750 from isolver/master

Improved Dlg window pos centering
Merge pull request #758 from philippwiesemann/fix-documentation-typos

DOC: Fix documentation typos
saveAsWideText now also returns dataframe

Only about two lines of code had to be added, simple DataFrame commands. and about 4 lines of code moved up in the function. Sorry the github preview shows a bunch of deleted spaces added back in, I think that's an artifact of copy/paste (I still don't have my local repository working). Tested with stand-alone Psychopy v1.81.02, but of course none of this should be heavily version-dependent. 

This is the minimal solution, just adding return of a dataframe to saveAsWideText. I suspect it violates psychopy convention and expectation. I should write a function whose only role is to return a dataframe. Also the code should be vectorised. I can add all this to a github issue that I can post. I don't have time to do much more this year, but if you really want a stand-alone function, I could inelegantly duplicate saveAsWideText, delete the file-writing lines and replace them with the DataFrame lines.

Let me know, the other thing that possibly has to be done is do it for ExperimentHandler.
ENH: Add four missing tooltips for preferences

This also fixed a typo in a fifth tooltip.
Merge pull request #761 from philippwiesemann/fix-preferences-tooltips

ENH: Add four missing tooltips for preferences
TESTS: travis needs pandas

Saving data from ExperimentHandler now expects pandas
Merge pull request #760 from alexholcombe/patch-1

saveAsWideText now also returns dataframe
ENH: Fix typos in benchmark wizard dialog
DOC: Fix typo in LICENSE.txt
DOC: Fix incorrect TTF file paths in LICENSES.txt
DOC: Fix typo in pylint configuration
DOC: Fix typo in README.txt
ENH: Fix typos in language name mappings
DOC: Fix typos in localization documentation
DOC: Fix typos in Builder demo READMEs
ENH: Fix typos in Coder demos