wendelin.core: v↑ 2.0.alpha2.pre1 -> 2.0.alpha2.post1

Finishing touches to release wendelin.core 2.0.alpha2:

- Switch to using File IO provided by Pygolang
- Fix build_dso on clean checkout (not relevant for SlapOS)

wendelin.core@11e023cf...ad6305c0

Tested via:

ERP5: https://nexedijs.erp5.net/#/test_result_module/20220127-586CEAFD
Wendelin: https://nexedijs.erp5.net/#/test_result_module/20220127-8444F82A
8 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:18:27

passed SlapOS.Eggs.UnitTest-Master.Python2

00:19:01

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:40

passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:25

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:29:24

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

22:06:16

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

20:24:02

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

09:20:00