[data access] changed checking of index in position to index for Set Dim

so far, method raised an exception as soon as there were no labels.
[data access] removed unchecked addition of 1 to the count

and removed unnecessary code,
[data access] changed tests according to count changes
[data access] change get offset and count for tags as for multiTags
[data access] adapt tests to changes of offset and count estimation
Merge pull request #416 from jgrewe/data_access

Data access

LGTM
introduced new isSIUnit function that also checks for compoud units
according tests
Section::getSection: accept name or id

Part of issue #354
Merge pull request #418 from gicmo/section_by_name

Section::getSection: accept name or id
File API name/ID cleaning issue #354
Section API name/ID cleaning issue #354
File API - corrections to the front #354
Merge pull request #420 from asobolev/master

File API name/ID cleaning issue #354

LGTM
Block.source API name/ID cleanup
Block.dataarray API name/ID cleanup
Block.multitag API name/ID cleanup
Merge branch 'dev'
Merge pull request #421 from asobolev/master

Block / Section API name/ID cleanup
add indexOf to SampledDimension