temp commit: custom _precompile_ function.

doesn't work, as PyCall objects not inited at precompilation time. You get `ArgumentError: ref of NULL PyObject`.

Solution is SnoopPreCompile, prolly (not now)

Author: tfiers

src/Sciplotlib.jl

@@ -32,6 +32,9 @@ include("util.jl")
 include("style.jl")
 export sciplotlib_style, set_mpl_style!
 
+include("precompile.jl")
+_precompile_()
+
 include("init.jl")
 export rcParams, rcParams_original
 

src/precompile.jl

@@ -0,0 +1,6 @@
+
+function _precompile_()
+    @info "Running Sciplotlib._precompile_"
+    plot(1:10, hylabel = "Piep")
+    # This gets displayed when precompiling in IJulia. But that's fine.
+end