Makefile.am: remove COPYING.LGPL from EXTRA_DIST
configure.ac: add --with-gettext-package to avoid conflicts

telepathy-account-widgets is a submodule, so it can be included by
multiple projects. If we don't have a different per-project
GETTEXT_PACKAGE we end up with different projects shipping .mo files
supposed to be installed in the same location.
build: add --with-icondir to set a different install path for icons
tpaw-account-widget: remove the ability to register accounts

This feature was never used anyway and most servers don't support it.
tpaw-account-widget: improve the size of the various fields

Fields in the main area now are at least 280px wide. This solves the
problem with fields being too small.

All the fields should expand to fix the available horizontal space. This
solves the problem with fields leaving empty space on their side (in
particular when the advanced section is expanded).
tpaw-account-widget: leave more space between username and password
tpaw-account-widget: use the symbolic clear icon for password fields
tpaw-calendar-button: use the symbolic clear icon
tpaw-contactinfo-utils: use title case for labels
tpaw-user-info: explain that the details will be shared with other users
tpaw-account-widget: set the apply button's text to "Add"/"Apply"

Before we set the text to "Log in" if the user was online and we were
creating a new account and "Apply" in other cases.