* Honor null callback in r_cmd
* Some enhacements in the r_config_description
* Implement cmd.repeat and add two commands to handle it
- . and .. (allow to handle pyew-like newline)
* Add ia and ia* to show all binary information info
- Use r_sys_cmd_str() instead of r_sys_cmd()
- This fixes the bug of not able to interpret output of .i?*
* Some random minor code simplifications
* r_sys_getenv now returns an allocated buffer
- Need some review to avoid memleaks
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