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Austrian mobile numbers can have 7-10 digits in the subscriber number

As listed in the table on page 17 of the Austrian ITU document https://www.rtr.at/en/tk/E129/2312_Austrian_Numbering_Plan_2011-03-30.pdf
a mobile number can be between 7 and 10 digits in the subscriber number. This is also something we noticed with some of our customers
as well.
Adapted Slovenian rule matching based on ITU and Twiki info

Page 1 of the ITU document http://www.itu.int/oth/default.aspx?lang=en&parent=T02020000BE indicates the
possible structures of the National (Significant) Numbers. We used this information, with the focus on
mobile numbers, to fix up the parsing rules. Furthermore, the maximum length of the NSN is 8 digits whic
meant that the previous parsing rule (fixed(2) >> split(3, 2, 2)) would not return the correct plausibility
results for valid numbers.

Added plausibility as well as formatting specs.
Split Italian mobile numbers into 3,4 chunks but allow the subscriber length to range from 6-8 digits.

The standard length of mobile numbers is 10 digits (3 + t subscriber), but as outlined here
http://en.wikipedia.org/wiki/Telephone_numbers_in_Italy#Mobile_telephones, there are 6-digit subscriber numbers
as well as 11. The ITU document for Italy, http://www.itu.int/dms_pub/itu-t/oth/02/02/T020200006B0001PDFE.pdf,
also touches on this on page 14 listing that the minimum number of digits for a mobile number is 9 (here they refer
to ndc + subcriber). Moreover, we also have users with these 9-digit numbers, which is how we actually stumbled
across this problem in the first place.
Extended Estonia number parsing to accept mobile numbers in the 5xx range to have a length of 7 or 8.

The ITU document on Estonia, http://www.itu.int/dms_pub/itu-t/oth/02/02/T02020000430001PDFE.pdf, indicates on
page 4 that the number range 50-59 contains 8 digits, however, if you look at http://en.wikipedia.org/wiki/Telephone_numbers_in_Estonia
and https://www.numberingplans.com/?page=plans&sub=phonenr&alpha_2_input=EE&current_page=69, it appears that this is not
entirely correct. the 5xx range can be either 7 or 8 digits long and this is something that we are also seeing with some of our
clients.

Now to be fair to the ITU document, as an additional remark, it states the following.

"Differences in § 19 section 1 of the “Estonian Numbering Plan” Regulation, Mobile telephone service"

I am not sure what other document this is referring to as the § 19 section 1 is not part of the one pointed to by the aforementioned link.
In either case, given the other sources of information along with some of our clients, it seems that the 7/8 digit is something that
needs to be taken into account.
Merge pull request #201 from tpena/enhancement/Slovenia-number-length

Adapted Slovenian rule matching based on ITU and Twiki info
Merge pull request #202 from tpena/enhancement/Austria-mobile-length

Austrian mobile numbers can have 7-10 digits in the subscriber number
Merge pull request #203 from tpena/enhancement/Italian-mobile-numbers

Split Italian mobile numbers into 3,4 chunks but allow the subscriber le...
Merge pull request #204 from tpena/enhancement/Estonian-mobile-numbers

Extended Estonia number parsing to accept mobile numbers in the 5xx rang...
Merge branch 'master' of github.com:floere/phony
2.8.4