Flame: speed up time to run

[nikolaqm]

Few performance updates for Flame, cutting down on time-to run when executing:

• re-uses node description now upon repeated re-runs (d5f9f843d628eec0f88d13a1449ee52e4a01e2a4)
• drops db only if exists (36e095c8452cdeac1e107560c80adb31abb58377)
• most significantly, moves all pipeline imports into __init__.py of entropylab.pipeline instead of entropylab root directory __init__.py, because before running anything under entropylab.flame. ... would unecessarily import all pipeline imports (which are numerous and heavy and were adding significant time to runs) (53e78b9055c6b3d47bda3095e7445a4d68f5349a) -- @qguyk please check this and if happy merge. @galwiner Note that documentation should then be updated as instead of import entropylab now we should use import entropylab.pipeline.

To-do in general: I am wondering if pipeline imports can be better organized so that only necessary modules are imported. Currently import is to wild. :)

[github-actions[bot]]

Unit Test Results

249 tests  ±0   245 :heavy_check_mark: ±0   50s :stopwatch: -4s     1 suites ±0       4 :zzz: ±0      1 files   ±0       0 :x: ±0 

Results for commit 8a1861c7. ± Comparison against base commit 8c7306ec.