Update lm_version.py

Merge pull request #168 from dkav/time-clock-fix

Replace time.clock with time.perf_counter

Resolve float object error

Resolve float object error using the floor division operator.

Update two user guides

point pinchpointmapper and centrality mapper to a download file of Circuitscape v4.07 . Cannot find CS4 on circuitscape.org.

Update version number

Linkage Mapper version 2

Linkage Mapper version 1.1

Linkage Mapper version 1