Hello

Following patch introduces a gprs context provisioning plugin.

It tries to find settings from a operator settings database for internet and 
mms type of gprs contexts. ims and wap types may be added later.

Provisioning logic: first try to find exact match for type,MCC,MNC and SPN. If 
that fails (or if SPN read from SIM is missing/empty), select first match for 
type/MCC/MNC.

Settings database is an XML formatted file, containing one <access>-element per 
settings for a specific type of GPRS context (internet, mms, ims)

Example:
<?xml version="1.0"?>
<settings>
<access type="internet" mcc="246" mnc="81" spn="oFono" name="Phonesim Internet" 
apn="internet.apn"/>
<access type="mms" mcc="246" mnc="81" spn="oFono" name="Phonesim MMS" 
apn="mms.apn" protocol="ipv4" username="mmsuser" password="mmspass" 
proxy="10.11.12.13:8080" mmsc="http://mms.example.com:8000"/>
</settings>

Plugin reads xml-files from a settings file directory in alphabetical order, 
until matching settings are found. This enables easy way to enable local 
variants by just installing separate configuration package that provides 
variant specific xml-file with name alphabetically earlier than the default 
settings file.


Open issue:
* Location of settings files: current code uses $CONFIGDIR/operator-settings, 
but I guess something like /usr/share/operator-settings would be better? 
(autoconf magic help needed)

--Jukka
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