Improve README for MID reject list macro

Author: dstocco

Detectors/MUON/MID/Calibration/macros/README.md

@@ -18,7 +18,7 @@ root -l
 .x ccdbUtils.C("querybad",1721252719000,"mask.txt",true,"http://alice-ccdb.cern.ch")
 ```
 
-Upload the default list of fake dead channels to the local CCDB (assuming that an instance of the local CCDB is running):
+Upload the default list of fake dead channels to the local CCDB (assuming that an instance of the local CCDB is running, see below):
 
 ```shell
 root -l
@@ -27,24 +27,53 @@ root -l
 
 The macro is also used to keep track of the fake dead channels, which are generated in `makeFakeDeadChannels()`.
 
-## buils_rejectList.C
+## build_rejectList.C
 
-This macro analyses the Quality flag and the Occupancy plot in the QCCDB and searches for issues appearing in the middle of the run, e.g. local board(s) that become noisy and are then excluded from the data taking by the user logic of the CRU.
-It then correlate this information with the GRPECS object in the CCDB in order to create a reject list that will allow to mask the faulty local board(s) from slightly before the problem appeared till the end of the run.
+This macro analyses the quality flag and the occupancy plots in the QCCDB and searches for issues appearing in the middle of the run, e.g. local board(s) that become noisy and are then excluded from the data taking by the user logic of the CRU.
+It then correlates this information with the GRPECS object in the CCDB in order to create a reject list that will allow to mask the faulty local board(s) from slightly before the problem appeared till the end of the run.
 
-Notice that the QCDB is not directly reachable from outside CERN. In that case one needs to first create an ssh tunnel:
+If a problem is found, the macro will ask to upload the reject list in the local CCDB.
+For this, one needs to have the local CCDB up and running (see below).
+
+The scan can be then performed with:
+
+```shell
+root -l
+.x build_rejectlist.C+(1716436103391,1721272208000)
+```
+
+Where the first number is the start timestamp for the scan, and the second is the end timestamp of the scan.
+
+### Running outside CERN network
+
+Notice that the QCDB is not directly reachable from outside CERN network.
+In that case one needs to first create an ssh tunnel:
 
 ```shell
 ssh -L 8083:ali-qcdb-gpn.cern.ch:8083 lxtunnel.cern.ch
 ```
 
-We also advice to have an instance of the local CCDB running, so that the reject list objects will be saved there.
-One can then scan for issues with:
+and then tell the macro to reach the QCDB via the tunneled local port:
 
 ```shell
 root -l
-build_rejectlist.C+(1716436103391,1721272208000,"localhost:8083")
+.x build_rejectlist.C+(1716436103391,1721272208000,"localhost:8083")
 ```
 
-Where the first number is the start timestamp for the scan, and the second is the end timestamp of the scan.
-For each problem found, the macro will ask if one wants to upload the reject list to the (local) CCDB or not.
+## Running the local CCDB
+
+The local CCDB server can be easily built through alibuild.
+As usual, one needs to be in the directory containing alidist and then run:
+
+```shell
+aliBuild build localccdb
+```
+
+The CCDB server can be then run with:
+
+```shell
+alienv enter localccdb/latest
+startccdb -r "path_to_local_ccdb"
+```
+
+where `path_to_local_ccdb` is a directory in your local pc where the CCDB objects will be located.