fix imports and requirements for Python 3.7

app/scodoc/requirements-3.7.txt

@@ -0,0 +1,47 @@
+alembic==1.6.5
+Babel==2.9.1
+blinker==1.4
+certifi==2021.5.30
+chardet==4.0.0
+click==8.0.1
+cracklib==2.9.3
+dnspython==2.1.0
+dominate==2.6.0
+email-validator==1.1.3
+Flask==2.0.1
+Flask-Babel==2.0.0
+Flask-Bootstrap==3.3.7.1
+Flask-Login==0.5.0
+Flask-Mail==0.9.1
+Flask-Migrate==3.0.1
+Flask-Moment==1.0.1
+Flask-SQLAlchemy==2.5.1
+Flask-WTF==0.15.1
+greenlet==1.1.0
+html2text==2020.1.16
+icalendar==4.0.7
+idna==2.10
+importlib-metadata==4.6.1
+itsdangerous==2.0.1
+Jinja2==3.0.1
+Mako==1.1.4
+MarkupSafe==2.0.1
+Pillow==8.3.1
+pkg-resources==0.0.0
+psycopg2==2.9.1
+PyJWT==2.1.0
+PyRSS2Gen==1.1
+python-dateutil==2.8.1
+python-dotenv==0.18.0
+python-editor==1.0.4
+pytz==2021.1
+reportlab==3.5.68
+requests==2.25.1
+six==1.16.0
+SQLAlchemy==1.4.20
+typing-extensions==3.10.0.0
+urllib3==1.26.6
+visitor==0.1.3
+Werkzeug==2.0.1
+WTForms==2.3.3
+zipp==3.5.0

app/scodoc/sco_debouche.py

@@ -28,7 +28,6 @@
 """
 Rapport (table) avec dernier semestre fréquenté et débouché de chaque étudiant
 """
-import safehtml
 
 from flask import url_for, g
 
@@ -39,6 +38,7 @@ from app.scodoc import VERSION
 from app.scodoc.sco_exceptions import AccessDenied
 from app.scodoc.scolog import logdb
 from app.scodoc.gen_tables import GenTable
+from app.scodoc import safehtml
 from app.scodoc import html_sco_header
 from app.scodoc import sco_core
 from app.scodoc import sco_permissions_check

app/scodoc/sco_news.py

@@ -39,18 +39,19 @@ from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from email.header import Header
 from operator import itemgetter
+import six
 import PyRSS2Gen  # pylint: disable=import-error
 
 import app.scodoc.sco_utils as scu
 import app.scodoc.notesdb as ndb
 from app.scodoc.notes_log import log
+from app.scodoc import safehtml
 from app.scodoc import sco_emails
 from app.scodoc.sco_utils import SCO_ENCODING, SCO_ANNONCES_WEBSITE
 from app.scodoc import sco_formsemestre
 from app.scodoc import sco_moduleimpl
 from app.scodoc import sco_preferences
 from app.scodoc import sco_users
-import six
 
 _scolar_news_editor = ndb.EditableTable(
     "scolar_news",