indent-region fails sometimes at last line, lp:1180653

could not reproduce the bug reported though, hope it's done with current trunk
menu - "Check" brought up at first panel

related menu cleanups
`py-pylint-run' fixed

Menu: mention `pip' beside `easy'_install
`py-shell' in a shell buffer doesnt work, lp:1182696

fixed
from within py-shell call another instance, lp:11696875 
 
fixed
menu Comment

`py-uncomment', `py-uncomment-intern'
`py-beginning-of-clause' fixed

wrong type argument, lp:901541, again

mark commands added

`py-shell-complete' fixed
docu updated
menu, mark forms again
`if-block', `try-block' forms dropped

considered useful in seldom cases only
`py-beginning-of-block' fixed

cursor would jump to the next beginning of block above,
disregard nesting-level, finding the wrong beginning
forgot