NF: experiment setting for useVersion

This commit: revise versionchooser.py
- support partial versions (e.g., '1.83' to mean 'latest patch-level within 1.83 series')
- availableVersions(): all major.minor.patch tags
- versionOptions(): all major.minor variants (no patches), suitable for menu
- ensureMinimal(): raise RuntimeError if current version is not recent enough

Issues: want to use _translate for error, but don't want to require app module in lib

createInitFile.py

@@ -79,7 +79,7 @@ def createInitFile(dist=None, version=None, sha=None):
 for pathName in prefs.general['paths']:
     sys.path.append(pathName)
 
-from psychopy.tools.versionchooser import useVersion
+from psychopy.tools.versionchooser import useVersion, ensureMinimal
 
 """
 

psychopy/__init__.py

@@ -44,4 +44,4 @@
 for pathName in prefs.general['paths']:
     sys.path.append(pathName)
 
-from psychopy.tools.versionchooser import useVersion
+from psychopy.tools.versionchooser import useVersion, ensureMinimal