ACIs predefined for modify fields lack type information

[westram]

The predefined ACIs are stored in source:trunk/lib/sellists

Prefixing these ACI expressions by name# does define a default destination field, which e.g. will be used by "modify fields of listed".

Currently arb handles these fields as typeless, i.e. the always needs to select a type manually.

Wanted behavior:

• default to STRING if no type specified
• allow to define a default type in .sellst
  Syntax: name[TYPE]#ACI
  where TYPE is one of INT, FLOAT or STRING(=default)

---

related change was done for #534