lib, lib-http: add HTTP_URL_ALLOW_PCT_NUL flag This allows a URL to contain %00.

lib: uri-util: Implemented API to check generic URI syntax. This allows checking whether something is a valid URI of any type. This change adds a test suite for the generic URI syntax, which is currently the main purpose of the API addition. Apart from a few simple vality checks, the test suite also tests various URI examples from RFCs.

uri-util: Changed URI host/authority parsing API to not use a boolean. The boolean indicated whether the basic reg-name syntax or the more limited Internet host name syntax was to be expected. This change creates separate functions for this.

uri-util: Added documentation for all functions in header.

uri-util: Made URI encoding functions accept NULL pointer for additional escaped characters.

uri-util: Made uri_data_encode() public.

uri-util: Split struct uri_host from uri_authority. Adds support for parsing host separately and manipulating host struct.

uri-util: Added support for initializing the URI parser from data.

uri-util: Parsing of unreserved syntax erroneously included percent encoding. This functionality is currently not used, so no problems would occur.

uri-util: Implemented proper parsing of DNS-based host name for URI schemes that use DNS host names, such as http and imap.

uri-util: Added public function for parsing single percent encoding instances.

uri-util: Removed have_port and have_host_ip flags. Presence of port can be tested with port != 0. Presence of IP can be tested with ip->family != 0.

uri-util: Added the possibility of only checking the URI without parsing any of the data.

uri-util: Added support for parsing bare authority URI component (for use in HTTP).

uri-util.h always requires net.h to compile, #include it

Added support for creating IMAP URLs.

Marked functions parameters that are allowed to be NULL. Some APIs were also changed. The non-obvious APIs where NULL parameter was changed to "" are master_service_init() and auth_master_user_list_init(). These checks can currently be enabled only on a patched clang: http://llvm.org/bugs/show_bug.cgi?id=6786

Error handling API changes to previous IMAP URL related changes.

liblib: Added generic URI parsing functions.