feat(bkgpslog): Consolidate VERSION writing, update functions

Bump version to 0.2.0 from 0.1.0.

style(timeUntilNextDay()). Set as version 1.0.0. Lowercased
returnState variable messages in function return code handling.

fix(timeDuration()). Fix missing $ in bash variable. Set to Version
1.0.0. Removed unused boolean variables.

feat(magicWriteVersion()): Add function to consolidate how VERSION
file is generated; VERSION file can be generated at start or if output
tar goes missing.

feat(magicWriteBuffer()): Take checkMakeTar() exit status into account
in order to determine whether or not to rerun
magicWriteVersion(). Relevant if output tar archive goes missing.