apps/nshlib: The free commands no longer used mallinfo() to get the state of...

apps/nshlib:  The free commands no longer used mallinfo() to get the state of the use heap.  Two reasons:  That is not useful information in the kernel build.  And (2) there are other memory resources of interest in other configurations such as the Kernel heap in PROTECTED and KERNEL builds, and the prog mem uses when FLASH is used to hold modifiable data.  The free command has been extended to just dump the content of procfs entries and to include all of these other memory resources of the procfs entries are available.