which is created from the null_value given at initialization.

This also solves the problem the new_tarval_from_str() and new_tarval_from_long() returned different
tarvals for the same values.

Reference modes are handled like integer modes, however, convert is only supported for NULL pointer (which might be wrong if null_value != 0)

[r7465]

[r7464]

[r7462]

[r7461]

fixed memory leak
removed useless transport of Call links

[r7459]

Added a default value.

[r7458]

[r7456]

[r7454]

[r7452]

[r7449]

[r7448]

[r7447]

[r7446]

[r7445]

[r7443]

[r7442]

[r7441]

[r7440]

[r7439]

run local_optimize() to remove tuple

[r7438]

[r7437]

[r7434]

[r7433]

[r7432]

[r7431]

[r7429]

[r7428]

[r7427]

[r7426]

[r7425]

[r7424]

[r7423]

Add flags for handling compound arguments (NYI)

[r7421]

[r7420]

[r7419]

[r7418]

[r7417]

[r7416]

[r7415]

[r7414]