ind_log: fix routine documentation.
ind_log: continuation characters unneeded in bracketed expressions.
ind_log: use built-ins as much as possible. For #50.
ind_log: time prefix routine is 'private'.

So use underscore prefix to indicate that.
ind_log: fixup compiler directives.

libraries should not light busylamp.
ind_log: bump version and update copyright.
readme: update link to ROS wiki pages.
ind_mth: update documentation.
ind_mth: fixup compiler directives.
ind_mth: use built-in math constants. For #50.
ind_log: update copyright notice.
ind_mth: bump version.