Util.pm: fix typo in doc

Use correct function name.
RT#86053: FAQ.pod: fix spelling error
Util.pm: simplify return on error

No need to distinguish between list and scalar mode.
Perl's return does this automatically for us.
LDAP.pm: use data_ready() in process()
LDAP.pm: new parameter bind(sasl_host => SASLHOST)

Use parameter sasl_host to be more flexible with respect to the hostname
in the SASL communication.

Note: this change is incompatible to the solution used in previous versions,
but it tries to do "The Right Thing" in more cases.

I learned that - although it is not directly mentioned in the SASL specs -
using IP addresses in SASL client_new() is not correct.
So the commit af63067, introdruced for perl-ldap 0.37, was wrong anyway.
Entry.pm: let update() fail correctly on illegal target

Let update createe a Net::LDAP::Message object that indicates error
when the destination to write to is neiter an Net::LDAP nor a
Net::LDAP::LDIF object.

While at it, call isa() as it is recommended by current UNIVERSAL.pm.
Schema.pm: call isa() as recommented in UNIVERSAL.pm

Do not call isa() as a function, but as a method of the current object.
This is the way it is recommended in current UNIVERSAL.pm.
{Control,Intermediate}.pm: fix typo in doc
Constant.pm: add constant LDAP_CONTROL_NOOP
Schema.pod: fix typo
*: correct spelling errors, harmonize spelling

among others:
- plural fixes:
  - URL's -> URLs
  - RFC's -> RFCs
- harmonization:
  - Github -> GitHub
  - lowercased -> lowercase
  - managedsait -> ManageDsaIT
  - thru -> through
  - unicode -> Unicode (proper name)
  - wikipedia -> Wikipedia (proper name)
  - boolean -> Boolean (adjective based on proper name)
*: grammar fix - remove reduplications

E.g. the the -> the
FAQ.pod: harmonized indentation
*.pod: more spelling harmonization

- ldap -> LDAP
- oid -> OID
- advertize -> advertise (by popularity ;-)
- IP number -> IP address
Entry.pm: ignore options when update()ing LDIF

Net::LDAP::LDIF->write_entry() expects Net::LDAP::Entry objects,
and does not support options.
Deal with it by ignoring the options.
Merge pull request #23 from marschap/next

preparation for next release
Release 0.57