Update to pgaccess 0.91.

src/bin/pgaccess/Makefile

src/bin/pgaccess/README

src/bin/pgaccess/copyright.html

src/bin/pgaccess/doc/html/copyright.html

src/bin/pgaccess/doc/html/tutorial/copyright.html

src/bin/pgaccess/doc/html/tutorial/newtable.tga

src/bin/pgaccess/doc/html/tutorial/tut_edit.html

src/bin/pgaccess/lib/database.tcl

src/bin/pgaccess/lib/help/copy.hlp

src/bin/pgaccess/lib/help/copyrights.hlp

src/bin/pgaccess/lib/help/reports.hlp

src/bin/pgaccess/lib/languages/chinese_big5

src/bin/pgaccess/lib/languages/euskara

src/bin/pgaccess/lib/mainlib.tcl

src/bin/pgaccess/lib/preferences.tcl

src/bin/pgaccess/lib/reports.tcl

src/bin/pgaccess/lib/schema.tcl

src/bin/pgaccess/lib/tables.tcl

src/bin/pgaccess/main.tcl