* new option for SNMP::get: force keys of return array be as in request array
* new option for SNMP::walk: use suffix of OID for keys in return array, not full OID

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

* 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

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Improved SNMP extension. FR #53594