pgAdmin III commit: Fix a lot of issues with length and precision

Fix a lot of issues with length and precision

The display of length and precision was buggy: not displayed in the textboxes, and textboxes not disabled when the user
wasworking on an existing user type. And a few other stuff. 

This work was required to allow the support of the new ALTER TYPE syntax options.

Branch
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REL-1_12_0_PATCHES

Details
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http://git.postgresql.org/gitweb?p=pgadmin3.git;a=commitdiff;h=4ed3b473d0d7db9f3b9143f68930ef4e35e26951

Modified Files
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pgadmin/dlg/dlgType.cpp       |  111 +++++++++++++++++++++++++++++++----------
pgadmin/include/dlg/dlgType.h |    3 +-
2 files changed, 86 insertions(+), 28 deletions(-)