TODO

libphclient
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* establish better conventions for returning error codes:
  * goal is to not have to create a new PH_ERR_* macro for each new situation
  * one possibility: if response code is other than LR_OK, return negative
    value of the response code
    (i.e., anything less than 0 is an error)
  * can provide a ph_strerror() function to front-end any negative
    return value
    (i.e., use strerror() if -1, otherwise use internal sys_errlist[] table)
* code cleanup:
  * add ph_dequote_value() to public API ???
  * check return values from strl*() functions
* API cleanup:
  * hide structures behind additional functions where possible
    (e.g., ph_next_entry(), ph_next_field(), etc)
* add phclient-config script for apps using -lphclient?
  (maybe include a flag to tell if it's thread-safe)
* add intelligent data caching mechanism
* provide perl module interface to libphclient

nph
---
* fix error message when ph_server file is empty:
	nph: fgets(): Error 0
* add ability to set default query selectors
* curses interface?  X interface?
* use editor to modify entire entry ???
* add auto-login capability ???
* enhance history (~/.ph_history, "!foo", etc) ???
* add close and open commands ???
* allow "change [selectors] add field=val" (to add "val" to whatever's
  already listed in field) ???
* allow command to be executed conditionally based on whether we were
  invoked in interactive mode