and upgrade code.
(build_ship, build_plane, build_land, supgr, pupgr, lupgr): Use them.
Upgrading planes no longer sets plane range to maximum.
(pupgr): Just clear the mission, don't bother to clear op area.
(doship, doplane, dounit): Editing tech now updates stats, like an
upgrade command. Proper range checking.
(warn_deprecated): New.
(pr_ship, doship): Deprecate key 'D'.
(pr_land, dounit): Deprecate key 'A' and 'D'.
of copies made by getvec(). This is safe, because the old code made
single copies and always flushed them back into the unit structures
before flushing those. Simplify.
(give, deliver_it): Use it instead of 9990.
(load_comm_ship, load_comm_land, rese): Use it instead of 9999.
(thre): Use it instead of 10000.
(check_market, explore, move, pln_dropoff): Use it instead of 32767.
(unload_it): Use it instead of 99999 (which couldn't possibly work,
but what do you expect from the autonav code).
(doland, mine, landmine, setsector, pln_dropoff): Use it. With
variables, mining beyond the capacity of variables (65535) was
ignored. Now the mines saturate at MINES_MAX.
To save space, the ancients invented `variables': a collection of
key-value pairs, missing means zero value, space for `enough' keys.
This complicates the code, as assigning to a `variable' can fail for
lack of space. Over time, `enough' increased, and for quite some time
now `variables' have been *wasting* space. This changeset replaces
them, except in struct mchrstr, struct lchrstr and struct pchrstr,
where they are read-only, and will be replaced later. It is only a
first step; further cleanup is required. To simplify and minimize
this necessarily huge changeset, the new item[] arrays have an unused
slot 0, and the old variable types V_CIVIL, ... are still defined, but
must have the same values as the item types I_CIVIL, ...
effect. Replace calls by struct assignment where possible. Replace
clear buffer, copy string to buffer by strncpy(). Use assignment to
clear when that's clearer. Replace overlapping copy through bounce
buffer by memmove(). Replace rest by standard memset() and memcpy().
Also use sizeof() instead of literal array sizes for robustness, and
instead of symbolic array sizes for clarity.
