Fix common typos in the source code (Reported in Bug #54065)
# External libraries were excluded
# Thanks eitan at eitanadler dot com for the first patch :)

follow CS:
- method set_security should be named as setSecurity
- SNMP_VERSION_2C constant

revert r309111 (name_len was not a typo)

fix typo in SNMP_SNPRINT_VALUE usage: use val_len, not name_length

* tune snmp2_walk.phpt
* more net-snmp v5.3 compatibility (OPAQUE_SPECIAL_TYPES)

* fix warning about redefining REGISTER_PDO_CLASS_CONST_LONG (damn copy'n'paste)
* tuned two unit test that failed at gcov.php.net/PHP_HEAD

fix warnings mentioned in 'Parameter Parsing Report'

remove compiler warnings
fix various memory leaks seen with --enable-debug

* new methods get_errno, get_error to get errno and error string
of last SNMP-related error
* formatting markup
* some fixes in max_oids logic: NULL will set it to default value,

* new methods get_errno, get_error to get errno and error string
of last SNMP-related error
* formatting markup
* some fixes in max_oids logic: NULL will set it to default value,
do not allow non-positive user-supplied values
* unit tests for changes

show more ...

fix parse errors for non_repeaters & max_repetitions: aligment errors

push most of SNMP query options into objid_query structure

enable HAVE_SHUTDOWN_SNMP_LOGGING

* Fix memory leak on concurrent new, open
* change comments to ANSI-C style
* added compatibility with net-snmp prior 5.4

- Fixed crash on unserialize(serialize(new SNMP))

- Fixed memory leak on serialize(new SNMP)

- Fixed memory leak

fix crash caused by incorrect offset altering

added r/o info property with basic session info,
fix crash in _get_properties in trunk

- fix build, wrong version id

preprocessed changes made in rev.307894:
keeping ext/snmp backwards compatible

- Improved SNMP extension:
. Allow ~infinite OIDs in GET/GETNEXT/SET queries. Autochunk them to max_oids
upon request.

- Fixed build

Improved SNMP extension. FR #53594

Fixed bug #51336

- Year++