[RFI+Patch] AT2 Modems.conf

Attached to this message is a patch to at2 to have modem definitions outside the source

I want you to test it and check if it's working and some comments/advise to some issues:

1. I'm opening a "kannel.conf" that is hard coded on the code. It's not easy to pass the full 
Cfg struct to smsc_at2, and it's not easy to pass the config filename also. If we have a modem-def
configuration with the filename value in smsc group, there's gonna be several modem-def for each 
smsc = at2. How can I say to at2 where is kannel.conf ? 
now that we have a include directive in configuration, at2 could read directly a modems.conf or the normal kannel.conf that includes the modems.conf, or have the modems groups directly at kannel.conf

2. at2_read_modems returns a ModemDef * structure. I should do a gw_free(ModemDef), but what
about the Octstr inside it ? (I haven't yet looked at list* functions). gw_free destroys everything, 
or should I do a destroy_modemdef() and octstr_destroy every octstr and then gw_free the ModemDef?

3. the function at2_read_modems accept id string or idnumber. This way, we could directly read the
modem definition for the modemtype, or cicle through it until returning NULL in detect_modem, as you
can see at the code

4. I've tested with Ericsson T68 and Nokia 6210 with success, defining modemtype and/or speed or
letting kannel detect the modem and speed
(I haven't yet discovered the right at+cnmi for ericsson :((( )

5. grp = list_extract_first(grplist) returns a CfgGrp, shouldn't I destroy it later ? list_destroy(grp, NULL)
gaves me an error and list_destroy((List*) grp, NULL) crashes :(

6. in modems definition, I've included a keepalive-cmd. This way, I can set ericsson and Nokia to do a
AT+CBC;+CSQ and receive +CBC: 0,63 (on batery, 63% full) and +CSQ: 15,99 (gsm signal quality) :)

7. At line 520, I've set timeout waiting for +CPIN reply to 10 seconds, could you test it with the that 
modem that takes too long to reply?

8. added a colon to +CMT search (+CMTI:) to prevent it from receiving +CMTI:

9. Where's the sim/me memory patch ? ;)

I'll wait for comments.

# Modems configuration
#
# Example and default values
# 
# group = modems
# id = "my-id"
# name = "my-name"
# detect-string = "MODEM"
# detect-string2 = "" [Default]
# init-string = "AT+CNMI=1,2,0,0,0" [Default]
# speed = 9600 [Default]
# enable-hwhs = "AT+IFC=2,2" [Default]
# need-sleep = false [Default]
# no-pin = false [Default]
# no-smsc = false [Default]
# sendline-sleep = 100 [Default, miliseconds]
# keepalive-cmd = "AT" [Default]


# If modemtype=auto, try everyone and defaults to this one
group = modems
id = generic
name = "Generic Modem"

group = modems
id = wavecom
name = Wavecom
detect-string = "WAVECOM"

group = modems
id = premicell
name = Premicell
detect-string = "PREMICEL"
no-pin = true
no-smsc = true

group = modems
id = siemens_tc35
name = "Siemens TC35"
detect-string = "SIEMENS"
detect-string2 = "TC35"
init-string = "AT+CNMI=1,2,0,0,1"
speed = 19200
enable-hwhs = "AT\\Q3"
need-sleep = true

group = modems
id = siemens_m20
name = "Siemens M20"
detect-string = "SIEMENS"
detect-string2 = "M20"
speed = 19200
enable-hwhs = "AT\\Q3"
need-sleep = true

group = modems
id = nokiaphone
name = "Nokia Phone"
detect-string = "Nokia Mobile Phone"
need-sleep = true
keepalive-cmd = "AT+CBC;+CSQ"

group = modems
id = falcom
name = "Falcom"
detect-string = "Falcom"
no-smsc = true

group = modems
id = ericsson_r520m
name = "Ericsson R520m"
detect-string = "R520m"
init-string = "AT+CNMI=3,2,0,0"

group = modems
id = ericsson_t68
name = "Ericsson T68"
detect-string = "23T68"
init-string = "AT+CNMI=3,1"
keepalive-cmd = "AT+CBC;+CSQ"

group = modems
id = alcatel
name = "Alcatel"
detect-string = "Alcatel"
init-string = "AT+CNMI=3,2,0,0"