Using chemformula package with babel-russian.

DESCRIPTION

The chemformula package and babel-russian settings (russian.ldf) define the same macro \ch.
The package chemformula-ru undefines babel's macro to prevent an error when 
both packages are loaded together.
Optionally it redefines the \cosh macro to print the hyperbolic cosine 
in Russian notations and/or defines new macro \Ch for that.

Licence: LPPL 1.3c or any later version.

Alexey Kuznetsov   mailtokuznetsov@gmail.com