fix pip installation

MANIFEST.in

@@ -1,2 +0,0 @@
-include regina/package-data/*
-include regina/sql/*.sql

m_teng/m_teng_interactive.py

@@ -66,8 +66,6 @@ from m_teng.utility.data import load_dataframe
 from m_teng.utility import file_io
 from m_teng.update_funcs import _Monitor, _ModelPredict, _update_print
 
-from m_teng.backends import keithley as _keithley
-
 config_path = path.expanduser("~/.config/m-teng.json")
 
 _runtime_vars = {

pyproject.toml

@@ -20,6 +20,7 @@ classifiers = [
 dependencies = [
     "matplotlib>=3.6",
     "numpy",
+    "pandas",
 ]
 
 [project.optional-dependencies]