/ Changes On Branch coroutine-refactor

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Changes In Branch coroutine-refactor Excluding Merge-Ins

This is equivalent to a diff from be24fbc221 to a522f364a6

Add opcodes OP_InitCoroutine and OP_EndCoroutine. Use these to remove the need for separate boolean registers to record when a co-routine has finished. (check-in: 5a88b6a7ae user: drh tags: trunk)
In the TCL bindings, make sure Tcl_AppendResult() is always terminated by "(char*)0" and not just "0". (check-in: ea4d23d1c0 user: drh tags: trunk)
Change the OP_InitCoroutine instruction to jump over the co-routine implementation. (Closed-Leaf check-in: a522f364a6 user: drh tags: coroutine-refactor)
Get rid of the OP_Undef and OP_IsUndef opcodes in favor of higher-level OP_InitCoroutine and OP_EndCoroutine. (check-in: 1ec0e9dd4b user: drh tags: coroutine-refactor)
Add the OP_Undef and OP_IsUndef opcodes. With these, use the first register in the result register range as the flag to indicate EOF on an INSERT from a SELECT, rather than allocating a separate boolean register for that task. (check-in: 6fb7448550 user: drh tags: coroutine-refactor)
More comment updates. No changes to code. (check-in: be24fbc221 user: mistachkin tags: trunk)
Update comments in vdbe.c. No changes to code. (check-in: 1122b410de user: drh tags: trunk)

Changes to src/insert.c.

Changes to src/select.c.

Changes to src/vdbe.c.

Changes to src/vdbeInt.h.

Changes to src/vdbeaux.c.

Changes to src/vdbemem.c.

Changes to src/where.c.