#rick-AST-ly

• Clarify unmake's intention to target specifically the (upcoming) 2008 POSIX release, as opposed to older POSIX standards
• Clarify more caveats in unmake capabilities and proper makefile authorship generally
• Allow upcoming POSIX 2008 assignment operators :=, ?=, and +=. Ensure := is treated as a macro declaration, rather than a rule declaration.
• Reject rules that have exactly zero prerequisites, zero inline commands, and zero indented commands, as make processing for such rules is undefined behavior.
• Fix dev environment provisioning script for unmake itself, in the event that some cargo packages are already installed
• Accelerate line counting update algorithm
• Add unit tests for more standard POSIX make elements