Fixing obsolete functions

Hello,
I changed a bunch of obsolete functions in the example's MELT code to the corresponding functions of the last version of MELT (0.9.9)

With this changes, I could run the examples 01-06... But I am still getting erros on the ex07:
```cc1: error: unknown MELT mode showpasses [of 25 modes]```
I tried to figure it out without success... If someone can help me to fix this example, it would be great!

Thanks