slightly improve config

Author: Christopher Doris

docs/src/compat.md

@@ -6,7 +6,7 @@ Some of these are "fixes" that are silently applied for you, and some are just e
 
 ## Stdlib
 
-Whenever a Python exception is displayed by Julia, `sys.last_traceback` and friends are set. This allows the post-mortem debugger `pdb.pm()` to work. Disable by setting `PythonCall.CONFIG.sysautolasttraceback = false`.
+Whenever a Python exception is displayed by Julia, `sys.last_traceback` and friends are set. This allows the post-mortem debugger `pdb.pm()` to work. Disable by setting `PythonCall.CONFIG.auto_sys_last_traceback = false`.
 
 ## Tabular data & Pandas
 

src/compat/gui.jl

@@ -7,7 +7,7 @@ This fixes the problem that Qt does not know where to find its `qt.conf` file, b
 always looks relative to `sys.executable`, which can be the Julia executable not the Python
 one when using this package.
 
-If `CONFIG.qtfix` is true, then this is run automatically before `PyQt4`, `PyQt5`, `PySide` or `PySide2` are imported.
+If `CONFIG.auto_fix_qt_plugin_path` is true, then this is run automatically before `PyQt4`, `PyQt5`, `PySide` or `PySide2` are imported.
 """
 function fix_qt_plugin_path()
     C.CTX.exe_path === nothing && return false
@@ -129,7 +129,7 @@ function init_gui()
     pycopy!(new_event_loop_callback, g["new_event_loop_callback"])
 
     # add a hook to automatically call fix_qt_plugin_path()
-    fixqthook = Py(() -> (fix_qt_plugin_path(); nothing))
+    fixqthook = Py(() -> (CONFIG.auto_fix_qt_plugin_path && fix_qt_plugin_path(); nothing))
     pymodulehooks.add_hook("PyQt4", fixqthook)
     pymodulehooks.add_hook("PyQt5", fixqthook)
     pymodulehooks.add_hook("PySide", fixqthook)

src/config.jl

@@ -1,5 +1,8 @@
 Base.@kwdef mutable struct Config
-    sysautolasttraceback :: Bool = true
+    auto_sys_last_traceback :: Bool = true
+    auto_fix_qt_plugin_path :: Bool = true
 end
 
 const CONFIG = Config()
+
+# TODO: load_config(), save_config()

src/err.jl

@@ -84,7 +84,7 @@ function Base.showerror(io::IO, e::PyException)
         return
     end
 
-    if CONFIG.sysautolasttraceback
+    if CONFIG.auto_sys_last_traceback
         try
             sys = pyimport("sys")
             sys.last_type = e.t