* wip
* first go at this, still some failing tests
* post-pairing with Grahame
* wip
* failing test cases
* fixed InstanceValidator to respect new validation options for both references and contained resources
* removed dead code
* put copyright back in BaseValidator
* wip
* add explicit control over the User-Agent header, and make sure headers flow through properly to all calls
* #328 - wrong processing of markdown URLs
* test fixes for URL handling
* fix tests
* improved validation of UUIDs
* fix test case dependency
* Add Dicom Package builder
* NPE fixes
* Smart Health Cards support in validator
* Fix bug generating spreadsheets due to sheet name length limitations
* Implement descendent-of filter
* more NPE fixes
* add Element.removeChild
* fix issue generation snapshot and content reference, and work around old erroneous binding description in R4
* improve SHC validation error
* fix for NPE generating ConceptMap spreadsheet
* fix crash in IG publisher rendering illegal content
* Improve slicing error messages
* more improving error message resolving slicing
* add missing code + track prohibited / required elements (improve rendering of IGs)
* fix for broken links in R4B IGs
* fix bug related to logger in FHIRToolingClient
* fix bug related to logger in context
* enable detection of whether tx server knows about value set and better track returned errors from tx server
* make likely source URL visible outside ProfileUtilities
* fix renderers - don't make nonvalid URLs into html links + fix NPE +
* fix bug with sheetnames generating spreadsheets
* supper branches in current version of packages
* report slicing information automatically where slicing is based on profile + fix shc support + support codesystem-properties-mode + fix value set validation on profiles + fix wrong entry point on vaildating contained resources with profiles
* fix misleading validation message + add -ips parameter for validator
* hint not warning when it's an example questionnaire
* wip
* adding tests for headers in client
* fix
* r4 updated httpclient
* updating http client code for r4 and dstu3
* dunno why this didn't get added before
