Sprout now compiles when linked with new sas-client library
Rework SAS error numbers
SAS markups - flatter event ID structure, translation between SAS and Sprout log levels, use the marker IDs from the SAS client library rather than keeping our own copy.
Further code review markups
Merge pull request #285 from Metaswitch/sasapi

[Reviewer: Alex] Sprout now compiles when linked with new sas-client library
Resolve merge conflict
Merge pull request #315 from Metaswitch/sasapi

[No review required] Resolve merge conflict