BIND 10 #2518: introduce exception hierarchy for "from text" errors in libdns++

[BIND 10 Development]

#2518: introduce exception hierarchy for "from text" errors in libdns++
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20131015
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * status:  new => reviewing
 * milestone:   => Sprint-20131015


Comment:

 I had introduced this common base class already as part of #1627. But now
 I've moved it from `name.h` to `exceptions.h` so it is in a more central
 place.

 Up for review.

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Ticket URL: <http://bind10.isc.org/ticket/2518#comment:1>
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