[Agda] Installing standard and plfa libraries

[Michel Levy]

I'm trying to write all the PLFA exercises.  But I have a problem
installing the pfla library.
More exactly the standard library is usable without "my home/.agda"
directory. This library doesn't have a "standard-library.agda-lib" file.
When I create a ".agda" directory with only the plfa library, I lose
access to the standard library.
This library doesn't have a "standard-library.agda-lib" file.
When I create a "my home/.agda" directory with only the plfa library, I
lose access to the standard library.
What do I have to do to get both standard and plfa libraries?

PS : my agda version is 2.5.3 installed with the Ubuntu packages.

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