Não incluir label em institution (original e aff-pmc)

Fixes #478
Merge branch 'tk_478' of github.com:robertatakenaka/PC-Programs into tk_478

Conflicts:
	src/scielo/bin/pmc/v3.0/xsl/sgml2xml/sgml2generic.xsl
Merge pull request #485 from robertatakenaka/tk_478

Tk 478