[kfreebsd] Remove sysctl(3) variables and read environment from kenv(2).
[kfreebsd] Fix formatting of floating-point numbers.
[kfreebsd] Implement clean-up for run-time system memory allocations to avoid leaking.
[kfreebsd] Plug in some memory leaks.
[kfreebsd] Add support for tracing memory leaks.
[kfreebsd] Implement memory consumption limiting for Mirage instances.
[kfreebsd] Refactor malloc()/free() calls.
[kfreebsd] Disallow dereferencing accidentally NULL pointers.
[kfreebsd] Set the minimal memory limit to 32 MB.