order config properties

order config properties lexicographically in “biocache config” command
support export by key range

support CSV export by key range
code formatting and cleanup

code formatting to comply with code standards and cleanup
javadocc-ing of duplicate detection

javadocc-ing of duplicate detection and code cleanup - more to be done
reduce exec memory alloc

reduce exec memory alloc to 2g instead of 16g
code readability

code readability
java doc

java doc
Range deletor

Range deletor for deleting records by a start and end key range
removed unused imports

removed unused imports
formatting and typos

formatting and typos
javadoccing and code style

javadoccing and code style in an attempt to make the code more readable