[BUGFIX] Change explanatory text of SYS error reporting config variables

Unify explanatory text of the variables [SYS][errorHandlerErrors],
[SYS][exceptionalErrors], [SYS][syslogErrorReporting] and
[SYS][belogErrorReporting] so that formatting, link to PHP doc and
the numerical default values are similar.

Resolves: #61942
Releases: master, 6.2
Change-Id: Iacdbf18ad5c181c499c23c4c50cebffc6736236c
Reviewed-on: http://review.typo3.org/33025
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
[DB] Increase max length of link fields

The current core supports links with the maximum length of 256 chars in
header links of tt_content elements and links in table
sys_file_reference.

External links can have much more than 256 chars.

Increasing the maximum length to 1024 should be enough - even current
browsers are supporting much more than 1024 chars.

Resolves: #61944
Releases: master, 6.2
Change-Id: I2031ebef959de696bc320b927ec1a462bcd5dd72
Reviewed-on: http://review.typo3.org/33052
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
[BUGFIX] Property of alternative model implementation not found

The PersistentObjectConverter is mapping submitted data to a
given target domain model. If a class gets overloaded with
config.tx_extbase.objects, this information is not forwarded
to the ReflectionService. That's why properties in alternative
implementations cannot be determined.

Resolves: #49803
Releases: 6.3, 6.2, 6.1
Change-Id: Ia4ec3a6c6f5bc6c07717a4956ab12e3e779c3c5a
[TEST] ...

Change-Id: Ia8700d6b6e374412e3300f12f4d6bb341deb4cfe