[FEATURE] pubchem client now uses requests library
[FIX] fixed typo in PubChemDB.py
[FEATURE] added Table.removePostfixes
[FIX] fixed metlin webservice client
Merge branch 'fix_metlin'
[DOCS] restored metlin example in tour.rst
[FEATURE] metlin client now returns column with link to identified substance
Merge branch 'master' of github.com:uweschmitt/emzed

Conflicts:
	libms/DataBases/PubChemDB.py