Samplesheets now handle dual indexes
Use npg::api::util to read sensor data. Use NPG_WEBSERVICE_CACHE_DIR for testing.
sensor.pm now uses npg::api::util
npg::api::util is deprecated - do not use it
Merge remote-tracking branch 'js10-remote/sensors' into devel

Conflicts:
	Changes
Merge remote-tracking branch 'mg8-remote/devel' into devel

Conflicts:
	Changes
refine description of sensors.pm change
Use immutable object style

which allows object creator to set attribute requiring the dual index
split, and have this attribute specify the size of the dual indexes
Merge pull request #3 from dkj/dual_index

Dual index - Use immutable object style
Merge pull request #2 from wtsi-npg/devel

merge changes from wtsi-npg
pulled changes from remote jenniferliddle/dual_index; resolved conflicts, fixed failing test
Merge pull request #176 from wtsi-npg/devel

pull request from wtsi devel to master to create release 77.3
Merge pull request #177 from wtsi-npg/master

pull wtsi master (release 77.3) to wtsi devel
added list of top level directories for HiSeqX
Merge pull request #3 from wtsi-npg/devel

merge changes from wtsi-npg
Updated Changes file
Merge pull request #178 from srl147/devel

HiSeqX change to seq_instr_checker
added HX (HiSeqX) to $INSTRUMENT_PATTERN
Merge pull request #179 from srl147/devel

added HX (HiSeqX) to $INSTRUMENT_PATTERN
Merge pull request #180 from wtsi-npg/devel

pull request from wtsi devel to master to create release 77.4