Added documentation to common_conversion.pyx
Another comment on common_conversion.pyx
Address comments on padic_generic_element.pyx
Addressing comments on sage/libs/linkages/padics/API.pxi
Update copyright notices.
Address comments in sage/libs/linkages/padics/mpz.pxi
Address comments in padic_template_element.pxi
Fixing problems with exponentiation and adding documentation.
ReST formatting in exponentiation helper functions.
Fixed comments based on FM_template.pxi