BIND 10 #2086: allow construct LabelSequence from "raw data"

[BIND 10 Development]

#2086: allow construct LabelSequence from "raw data"
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                   Reporter:         |                 Owner:  muks
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120717
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  6
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => muks


Comment:

 OK, addressed initial comments, and added a number of basic checks in the
 raw constructor.

 I made all of the errors BadValue, even though we have separate exceptions
 for two of the error conditions, but it seems more usable to only have to
 catch one exception here.

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Ticket URL: <http://bind10.isc.org/ticket/2086#comment:11>
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