Just few code improvements:
Just few code improvements:

- enable summary option which didn't work previously
- add -summary to doc string
- use core-like page.save
- remove obsolete script name from showHelp

Change-Id: Iab5cde2d9b6f07e3df3d58ca7e952f57574a35f8

PersianWikipedia/pywikibot-core,icyflame/batman,hasteur/g13bot_tools_new,hasteur/g13bot_tools_new,jayvdb/pywikibot-core,jayvdb/pywikibot-core,magul/pywikibot-core,smalyshev/pywikibot-core,valhallasw/pywikibot-core,happy5214/pywikibot-core,happy5214/pywikibot-core,Darkdadaah/pywikibot-core,VcamX/pywikibot-core,npdoty/pywikibot,TridevGuha/pywikibot-core,emijrp/pywikibot-core,h4ck3rm1k3/pywikibot-core,trishnaguha/pywikibot-core,npdoty/pywikibot,wikimedia/pywikibot-core,h4ck3rm1k3/pywikibot-core,darthbhyrava/pywikibot-local,xZise/pywikibot-core,Darkdadaah/pywikibot-core,magul/pywikibot-core,hasteur/g13bot_tools_new,wikimedia/pywikibot-core