Fix WHYF_perror() format string error
Fix -Wsign-compare warnings: make loop counters unsigned
Fix -Wsign-compare warnings in keyring: unsigned cn,in,kp
Fix -Wsign-compare warnings: use size_t or unsigned for byte counts
Fix -Wsign-compare warnings in CLI

Make cli_printf() return void (log errors instead)

Better size_t arithmetic in outv_growbuf()
Change overlay_buffer fields from int to size_t

Fixes many -Wsign-compare warnings
Use UINT64_MAX instead of -1 for Rhizome HTTP response content_length

Fixes -Wsign-compare warnings
Fix -Wsign-compare warnings in VoMP code
Fix -Wsign-compare warnings in SLIP code
Use RHIZOME_SIZE_UNSET instead of -1 for read_state.length

This may have been a reversion to older code caused by a careless
merge, because the change to RHIZOME_SIZE_UNSET was already made
when read_state.length was changed to unsigned.

Fixes some -Wsign-compare warnings
Use ssize_t for read(2) and write(2) return value

Test for errors using == -1 not < 0, and cast to (size_t) subsequently

Fixes some -Wsign-compare warnings
Eliminate unused variable
Used unsigned for byte count fields in Radio Link code

Fixes -Wsign-compare warnings
Better size arithmetic in Rhizome database cleanup code

Fixes -Wsize-compare warnings