add a new Zaptel scanning tool, primarily for use by the Asterisk GUI, called 'ztscan'. this tool outputs an Asterisk-style

configuration file containing one context for each Zaptel span with all the details that can be learned about that span. to
enable this tool, the ZT_SPANSTAT ioctl gained a number of new elements to report information about the spans:
  - linecompat (available signaling modes for digital spans)
  - spantype (T1, E1 or J1 for digital spans)
  - location (PCI/PCI-Express location)
  - manufacturer
  - devicetype

Along the way I also found that the digital span drivers always set T1-style signaling bits in 'linecompat' even for E1 spans,
and that the ZT_SPANCONFIG ioctl did not properly check these bits when configuring E1 spans. The result of this is that it was
possible to configure T1-only coding/framing (AMI/B8Zs, D4/ESF) on E1 spans (but not the reverse); this has been corrected and
any attempt to use T1-only coding/framing on E1 spans will now result in an error from ztcfg.

Also did some minor simplification of the Makefile rules that build the userspace tools.

(the basics of ztscan were written by Brandon Kruse then reworked and fleshed out by me)



git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.4@3278 5390a7c7-147a-4af0-8ec9-7488f05a26cb

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