Backport any necessary ICU changes and fixes

[david]

We need to figure out

• what exact ICU version we ported back then
• what ICU version branch this corresponds to
• what fixes were made in that branch

And then backport all the fixes so we're free of ICU bugs. See #723 for instance.

Current state of affairs: (as in [4054])

should be ported:

icu/trunk/source/test/intltest/dadrcal.cpp icu/trunk/source/test/intltest/dadrcal.h icu/trunk/source/test/testdata/calendar.txt

ICU Release dates:

• 3.4.0  [icu 18360] 2005-07-26
• 3.4.1  [icu 19336] 2006-03-09
• 3.6.0  [icu 20189] 2006-08-29
• 3.8.0  [icu 22674] 2007-09-13
• 3.8.1  [icu 23075] 2007-12-12
• 4.0.0  [icu 24330] 2008-07-01
• 4.0.1  [icu 25253] 2009-01-14

3.8.0: AgaviCalendar =>

 i18n/calendar.cpp  [icu 22016]
 i18n/unicode/calendar.h  [icu 22265]

4.0.0: AgaviCalendarGrego =>

 i18n/gregoimp.cpp  [icu 22167]
 i18n/gregoimp.h  [icu 22167]

3.8.0-dev: AgaviDateDefinitions =>

based largely on  i18n/calendar.h  [icu 20375]
and  i18n/ucal.h  [icu 19775]

3.8.0: AgaviGregorianCalendar =>

 i18n/gregocal.cpp  [icu 22379]
 i18n/unicode/gregocal.h  [icu 19003]

3.6.0: AgaviOlsonTimeZone =>

 i18n/olsontz.cpp  [icu 19133]
 i18n/olsontz.h  [icu 18762]

3.8.0-dev: AgaviSimpleTimeZone =>

 i18n/simpletz.cpp  [icu 21282]
 i18n/unicode/simpletz.h  [icu 18762]

3.8.0-dev: AgaviTimeZone =>

 i18n/timezone.cpp  [icu 22069]
 i18n/unicode/timezone.h  [icu 18762]

3.8.0-dev: CalendarTest =>

 test/intltest/caltest.cpp  [icu 21087]

4.0.0: TimeZoneBoundaryTest =>

 test/intltest/tzbdtest.cpp  [icu 19558]

3.8.1-dev: TimeZoneTest =>

 test/intltest/tztest.cpp  [icu 22096]
MISSING:

• TimeZoneTest::TestCountries?()
  
• (TimeZoneTest::TestEquivalentIDs())
  
• REDO: testShortZoneIDs

[david]

not necessary for rc1

[dominik]

The direct file links don't work (seems to be related to icu using trac 10.4 :/ )

[dominik]

(In [4054]) backport icu bugfixes refs #858

[david]

(In [4131]) merging branches/dominik-icu-backport, closes #858

[david]

(In [4135]) merge [4134/branches/dominik-icu-backport], refs #858

[dominik]

(In [4158]) Custom timezones now have GMT+0000 as id instead of AgaviTimeZone::CUSTOM renamed getGmtString to formatOffset and made it public refs #858