Fix checks for seconds and timezones in generalized times.
Fixing the CHECK_RANGE macro in r1.4 revealed that the seconds check
accidentally relied on the macro being broken. While looking into this

Fix checks for seconds and timezones in generalized times.
Fixing the CHECK_RANGE macro in r1.4 revealed that the seconds check
accidentally relied on the macro being broken. While looking into this I
noticed that the timezone check was also wrong, treating the timezone as
optional for generalized times.

investigation and diff mostly by Seiya Kawashima.

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multi-statement CHECK_RANGE() macro isn't safe for all placements, and
needs to use "do {} while 0" idiom; all callers need repair also.
Discovered by jsg

The <ctype.h> is*() interfaces expect EOF or an unsigned char; cast to
(unsigned char) as required

found by Michael McConville (mmcconv1 (at) sccs.swarthmore.edu) w/Coccinelle

unsigned char casts for ctype
ok jca

Implement attribute syntaxes from RFC4517. This adds validation to the most
common attribute types. Specialized attribute types like Delivery Method or
Teletex Terminal Identifier are recognized for

Implement attribute syntaxes from RFC4517. This adds validation to the most
common attribute types. Specialized attribute types like Delivery Method or
Teletex Terminal Identifier are recognized for completeness, but not
validated.

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