Merged changes from Pigeonhole v0.2 tree.

INSTALL

TODO

doc/script-location-dict.txt

m4/dovecot.m4

src/lib-sieve-tool/sieve-tool.c

src/lib-sieve/Makefile.am

src/lib-sieve/plugins/enotify/mailto/ntfy-mailto.c

src/lib-sieve/plugins/environment/ext-environment-common.c

src/lib-sieve/plugins/environment/sieve-ext-environment.h

src/lib-sieve/plugins/include/cmd-include.c

src/lib-sieve/plugins/include/ext-include-binary.c

src/lib-sieve/plugins/include/ext-include-common.c

src/lib-sieve/plugins/include/ext-include-common.h

src/lib-sieve/plugins/notify/cmd-notify.c

src/lib-sieve/plugins/vacation/cmd-vacation.c

src/lib-sieve/sieve-actions.c

src/lib-sieve/sieve-binary-file.c

src/lib-sieve/sieve-binary.c

src/lib-sieve/sieve-binary.h

src/lib-sieve/sieve-common.h