[GRASSLIST:6829] update from 5.3

[javier garcia]

Hello; my computer has crashed so I'm going to install everything again.

I used to have 5.3 version og GRASS (for me very good job along with postgres 
and R) and now I've seen that the las is 6.0.0. But I've downloaded it and 
the source is very small.

Please, what should I install to have a complete upgraded & stable version?

First 5.4 and then 6.0?

Would all my old grass53 databases work directly with this?

Thank you for the help and best wishes,

Javier