Add line continuations when commands are word-wrapped.

README

@@ -127,7 +127,7 @@ A log file with a site section to ignore. Order does not matter::
 
 A mix of both above examples. Order matters !::
 
-  apachedex --skip-base "/site1/ignored(/|$|\?)"
+  apachedex --skip-base "/site1/ignored(/|$|\?)" \
   --base "/site1(/|$|\?)" "/site2(/|$|\?)"
 
 Matching non-ASCII urls works by using urlencoded strings::
@@ -137,12 +137,12 @@ Matching non-ASCII urls works by using urlencoded strings::
 Naming websites so that report looks less intimidating, by interleaving
 "+"-prefixed titles with regexes (title must be just before regex)::
 
-  apachedex --default "Public website" --base "+Back office"
+  apachedex --default "Public website" --base "+Back office" \
   "/backoffice(/|$|\\?)" "+User access" "/secure(/|$|\\?)" access.log
 
 Saving the result of an analysis for faster reuse::
 
-  apachedex --default foo --format json --out save_state.json --period day
+  apachedex --default foo --format json --out save_state.json --period day \
   access.log
 
 Although not required, it is strongly advised to provide `--period` argument,
@@ -152,13 +152,13 @@ converted to a larger period.
 
 Continuing a saved analysis, updating collected data::
 
-  apachedex --default foo --format json --state-file save_state.json
+  apachedex --default foo --format json --state-file save_state.json \
   --out save_state.json --period day access.2.log
 
 Generating HTML output from two state files, aggregating their content
 without parsing more logs::
 
-  apachedex --default foo --state-file save_state.json save_state.2.json
+  apachedex --default foo --state-file save_state.json save_state.2.json \
   --period day --out index.html
 
 
@@ -184,14 +184,14 @@ directory of referencing file, or current working directory for command line.
 
 - command line::
 
-    apachedex --skip-base "/ignored(/|$|\?)" @foo/dev.cfg --out index.html
+    apachedex --skip-base "/ignored(/|$|\?)" @foo/dev.cfg --out index.html \
     access.log
 
 This is equivalent to::
 
-  apachedex --skip-base "/ignored(/|$|\?)" --error-detail
-  --default Front-office --prefix "+Back office" "/back(/|$|\?)"
-  --skip-prefix "/baz/ignored(/|$|\?)" --prefix +Something "/baz(/|$|\?)"
+  apachedex --skip-base "/ignored(/|$|\?)" --error-detail \
+  --default Front-office --prefix "+Back office" "/back(/|$|\?)" \
+  --skip-prefix "/baz/ignored(/|$|\?)" --prefix +Something "/baz(/|$|\?)" \
   --stats --out index.html access.log
 
 Portability note: the use of paths containing directory elements inside
@@ -213,7 +213,7 @@ For better performance...
   adapt its data structure to analysed time range before there is too much
   data::
 
-    apachedex [...] access.log.1.gz access.log.99.gz access.log.2.gz
+    apachedex [...] access.log.1.gz access.log.99.gz access.log.2.gz \
     access.log.3.gz [...] access.98.gz
 
 - parse log files in parallel processes, saving analysis output and aggregating