BUG test that shows hdf str corruption (GH6505)
reopening store if it get closed during iteration
reopen for select_as_mutiple
fix for append_as_multiple

Conflicts:

	pandas/io/pytables.py
fixed for python2.6
actually using splitted min_itemsize
Merge branches 'select-iter-recusive', 'append-multipe-datacolumns' and 'pytables-str-corruption'
BUG: fix by removing optimization ... (GH6505)
Merge branch 'pytables-str-corruption'
BUG test for extract on empty series (GH7241)
FIX extract on empty series with >1 groups (GH7241)
Merge branch 'extract-empty-fix'
Merge branch 'master' of https://github.com/pydata/pandas
BUG StringMethods on empty series (GH7241)