v3.2.8-lpc-v0.2: Revert "Allow creation of session and track from abstract"

revert creation of session and track from an abstract

v3.2.8-lpc-v0.1

• update tp v3.2.8
• add matrix fields to sessions
• add contributions command to cli
• allow creation of session and track from an abstract

v3.2.2-lpc-v0.2

Fix merge conflict in registration email after update to v3.2.2

v3.2.2-lpc-v0.1

Update indico to v3.2.2

v3.1.1-lpc-v0.4

• CSS changes
• Links to sessions from /program page

v0.3

• rebase on v3.1.1
• add abstract contents to the generated CSV and XLSX

v0.2

v3.0.3-lpc-v0.2

LPC: add notificatoins for abstract comments

v0.1

• v0.1